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Petrography of Middle Jurassic to Early Cretaceous sandstones in the Kutch Basin, western India: Implications on provenance and basin evolution
Journal of Palaeogeographyvolume 7, Article number: 2 (2018)
This paper investigates the provenance of Middle Jurassic to Early Cretaceous sediments in the Kutch Basin, western India, on the basis of mineralogical investigations of sandstones composition (Quartz–Feldspar–Lithic (QFL) fragment), Zircon–Tourmaline–Rutile (ZTR) index, and mineral chemistry of heavy detrital minerals of the framework. The study also examines the compositional variation of the sandstone in relation to the evolution of the Kutch Basin, which originated as a rift basin during the Late Triassic and evolved into a passive margin basin by the end Cretaceous. This study analyzes sandstone samples of Jhumara, Jhuran and Bhuj Formations of Middle Jurassic, Upper Jurassic and Lower Cretaceous, respectively, in the Kutch Mainland. Sandstones record a compositional evolution from arkosic to subarkosic as the feldspar content decreases from 68% in the Jhumara Formation to 27% in the Bhuj Formation with intermediate values in the Jhuran Formation. The QFL modal composition indicates basement uplifted and transitional continental settings at source. Heavy mineral content of these sandstones reveals the occurrence of zircon, tourmaline, rutile, garnet, apatite, monazite and opaque minerals. Sub-rounded to well-rounded zircon grains indicate a polycyclic origin. ZTR indices for samples in Jhumara, Jhuran and Bhuj Formations are 25%, 30% and 50% respectively. Chemistry of opaque minerals reveals the occurrence of detrital varieties such as ilmenite, rutile, hematite/magnetite and pyrite, in a decreasing order of abundances. Chemistry of ilmenites in the Jhumara Formation reveals its derivation from dual felsic igneous and metabasic source, while those in Jhuran and Bhuj Formations indicate a metabasic derivation. Chemistry of garnet reveals predominantly Fe-rich (almandine) variety of metabasic origin. X-ray microscopic study provides the percentage of heavy minerals ranging from 3% to 5.26%. QFL detrital modes reflect the evolution of the basin from an active rift to a passive margin basin during the Mesozoic. Integration of results from QFL modal composition of the sandstones, heavy mineral analysis and mineral chemistry, suggests sediment supply from both northern and eastern highlands during the Middle Jurassic. The uplift along the Kutch Mainland Fault in the Early Cretaceous results in curtailment of sediment input from north.
Composition of major and accessory heavy minerals in sandstones provide crucial information regarding the provenance of sedimentary basins (Armstrong-Altrin et al. 2012, 2015, 2017; Arribas et al. 2000; Caracciolo et al. 2012; Critelli and Ingersoll 1994; Critelli and Le Pera 1994; Critelli et al. 2003; Le Pera and Critelli 1997; Paikaray et al. 2008; Saha et al. 2010). Petrographic investigation of sandstone is widely used to infer tectonic setting, source rock composition, transportation and environment of deposition (Dickinson 1970, 1985; Dickinson and Suczek 1979; Dickinson et al. 1983; Ingersoll and Suczek 1979; Le Pera and Arribas 2004; Le Pera et al. 2001; Zuffa 1985, 1987). Sediments derived from cratonic sources (low-lying, granitic or gneissic with recycled platform sediments) are generally quartzose sands with high monocrystalline quartz (Qm)/polycrystalline quartz (Qp) and K-feldspar (K)/plagioclase feldspar (P) ratios, and deposited in continental interiors or passive continental margins (Dickinson 1985). Sandstones derived from fault-bounded continental basement uplifts result in lithic-poor quartzo-feldspathic sands of typically arkosic composition (Dickinson 1985; Dickinson and Suczek 1979).
Heavy mineral constituents in sandstones further refines the understanding of provenance (Andò and Garzanti 2014; Andò et al. 2012; Hounslow and Morton 2004; Hubert 1962; Mange and Maurer 1992; Mange and Morton 2007; Morton and Chenery 2009; Morton and Hallsworth 1999; Zack et al. 2004). While transmitted light optical microscopy reveals the composition of transparent heavy minerals (Mange and Maurer 1992), electron microprobe analyser (Basu and Molinaroli 1989, 1991; Dill 1998; Dill and Klosa 2011; Weibel and Friis 2004) and Raman spectroscopy (e.g., Andò and Garzanti 2014) identify the opaque constituents. Heavy minerals, like garnet, ilmenite, zircon, rutile, tourmaline, and epidote, may exhibit significant variation in chemical composition depending on conditions of formation of their parent rock (Mange and Morton 2007; Meinhold 2010; Morton and Chenery 2009; Morton et al. 2004; Preston et al. 2002). Ilmenites from mafic igneous sources exhibit higher concentrations of TiO2 (~ 50%) than those from felsic igneous source
s (~ 48%) (Grigsby 1992). Ilmenites from felsic igneous rocks contain > 2% MnO (Grigsby 1992) whereas ilmenites from metamorphic source rocks contain ~ 52% TiO2 and < 0.5% MgO (Basu and Molinaroli 1989). Garnets with low Mg and variable Ca are derived from amphibolite facies metasedimentary rocks while high Mg and high Ca indicate high-grade mafic and ultramafic gneissic source rocks (Mange and Morton 2007). Although unexplored, the use of X-ray microscopic technique enables rapid visualization and quantification of dense phases (Andrews et al. 2010).
Biswas (1987) considered the Kutch Basin as a rift basin, however, other researchers contested this interpretation (Roy et al. 2007). A few studies documented major and trace element composition of clastic sediments of the Kutch Basin (Ahmad and Bhat 2006; Ahmad et al. 2014). Most of these studies lack information on petrography, and completely ignore heavy minerals. The objective of this study is to understand the source of sediments deposited in the Kutch Basin and to infer the tectonic framework of the basin during deposition of these sediments, based on conventional petrographic analysis and heavy mineral composition. We have also attempted to characterize the 3-D distribution of mineral phases of sandstone on the basis of X-ray microscopy technique.
The study area, the Kutch Basin is located in the northwestern part of the western continental margin of India between latitude 22°30′ and 24°30’ N, and longitude 68° and 72°E. This basin was formed by the Late Triassic–Late Jurassic rifting during India’s northward drift post Gondwanaland breakup (Biswas 1982, 1987, 2005). Biswas (1987) considered the Kutch Basin as a pericratonic rift initiated by the reactivation of primordial faults in the Precambrian Aravalli–Delhi fold belt. The basin has accumulated ~ 3000 m of siliciclastic and carbonaceous sediments from Late Triassic to Early Cretaceous (Biswas 1987). The boundaries of the Kutch Basin are demarcated by the Nagar Parkar Fault (NPF) to the north, the North Kathiawar Fault (NKF) to the south, the Radhanpur Arch (Radhanpur–Barmer Arch) to the east and merges with the continental shelf to the west. This basin has prominent uplifted areas exposing Mesozoic rocks: the Nagar Parkar Uplift (NPU), the Island Belt Uplift (IBU) (comprising of the Patcham Uplift (PU), the Khadir Uplift (KU), the Bela Uplift (BU) and the Chorad Uplift (CU)), the Wagad Uplift (WU) and the Kutch Mainland Uplift (KMU), linked to the Nagar Parkar Fault (NPF), the Island Belt Fault (IBF), the South Wagad Fault (SWF) and the Kutch Mainland Fault (KMF), respectively (Fig. 1a).
During the early syn-rift stage of Middle Jurassic, the basin had three prominent highs, the Nagar Parkar Uplift, the Island Belt Uplift and the Kathiawar Uplift. During the Kimmeridgian (Late Jurassic), the basin recorded shoreline transgression, resulting in deposition of late syn-rift sediments in most parts of the basin. During the Early Cretaceous, the basin experienced activation along Kutch Mainland Fault (KMF) resulting in the rise of Kutch Mainland Uplift (KMU), dividing the basin into the Gulf of Kutch Half Graben (GoK-HG) and the Banni Half Graben (BHG). The Kutch Mainland covers the largest part of this basin with a south-westerly dipping resultant slope (Biswas 1991, 2005). This region exposes most of the undisturbed Mesozoic rocks along the NW–SE trending chain of domal outcrops (Fig. 1b) (Alberti et al. 2013). The present study area is located within the Kutch Mainland between Zara in the west and Tapkeshwar in the east (Fig. 1a).
Biswas (2005) considered that the Mesozoic succession of the Kutch Mainland comprises poorly-exposed continental sediments of Late Triassic, marine sediments of Middle to Late Jurassic representing syn-rift stage, and fluviomarine sediments of Late Jurassic to Early Cretaceous corresponding to late syn-rift to post-rift stage. The roughly 290-m-thick Bathonian–early Callovian Jhurio Formation rests unconformably over the Precambrian basement and mainly comprises of limestone-shale alternations (Fig. 1c; Table 1). This is conformably overlain by nearly 275-m-thick Callovian-Oxfordian (early syn-rift) sediments of the Jhumara Formation. It consists of argillaceous rocks at the base, which is followed upward by a predominantly carbonate succession with subordinate shale (Biswas 2005). This is overlain by ~ 750 m of Kimmeridgian to Tithonian (late syn-rift) sediments of the Jhuran Formation primarily consisting of sandstone-shale alternations, exhibiting an overall coarsening-upward trend (Arora et al. 2015). The Jhuran Formation is unconformably overlain by ~ 815 m thick Valanginian–Albian (post-rift) sediments of the Bhuj Formation comprising sandstone and shale.
Detailed investigation revealed that the Jhurio and Jhumara Formations represent shallow marine deposits in the inner to middle shelf (Fürsich et al. 1992, 2001; Krishna et al. 2000; Singh 1989), whereas the Jhuran Formation comprises storm-laid sandstones intervening with gray to black shale in outer to inner shelf environments (Arora et al. 2015, 2017). Recently Mandal et al. (2016) and Bansal et al. (2017) recorded shallow marine, estuarine and fluvial deposits within the Bhuj Formation.
Materials and methods
This study focuses on the entire set of the grain population, including both light and heavy minerals present in the framework sandstones of Jhumara, Jhuran and Bhuj Formations, collected from six locations viz. Zara, Nirona, Palara, Gangeshwar, Bhuj and Tapkeshwar (Fig. 1a). Framework modal analysis was carried out on 6 samples of Jhumara Formation, 19 samples of Jhuran Formation and 6 samples of Bhuj Formation (Fig. 1c). For thin section preparation, sample chips were hardened with a 3:1 mixture of Beuhler® epoxy hardener and epoxy resin inside a vacuum impregnation unit. These chips were then mounted on glass slides and polished using various grades of polishing powders (400 μm, 600 μm, 800 μm, 1200 μm, 3 μm, 1 μm, 0.3 μm and 0.05 μm). Thin sections were studied using a Leica DM 4500P polarizing microscope attached to a Leica DFC420 camera.
Fresh sandstone samples were pulverized for heavy mineral analysis. The 63–125 μm size fraction of the samples was kept in an ultrasonic bath for 10–15 min to remove clay particles and later dried in an oven at 50 °C. Sodium polytungstate liquid (density 2.9 g/ml) was used for heavy mineral separation by gravity settling (Mange and Maurer 1992). The heavy fraction was washed thoroughly using distilled water and isopropyl alcohol and allowed to dry. A small amount of the dried heavy fraction was sprinkled over a slide containing a mixture of three parts of Beuhler® epothin 2 epoxy resin with one part of Beuhler® epothin 2 epoxy hardener. Care was taken to spread the grains uniformly. The slide was kept untouched till dryness and subsequently studied using Leica DM 4500P polarizing microscope attached to a Leica DFC420 camera. Chemical analysis of heavy minerals seen in rock thin sections was carried out using a Cameca SX 5 Electron Probe Micro Analyzer at Department of Earth Sciences, IIT Bombay, India, with an accelerating voltage of 15 kV, specimen current of 20 nA and beam diameter of 1 μm.
Small chips of selected samples were used for heavy mineral investigation using X-ray microscopy. The sandstone samples were broken into fragments of nearly 1 mm × 1 mm × 1 mm. The sample was mounted on a pin-head using super-glue prior to placing the pin inside a sample holder. The analyses were carried out using XRadia Versa 520 by Carl Zeiss®. The sample holder was placed inside the instrument, and the energy of X-rays, source–detector distances, objectives and filters were adjusted using the Scout and Zoom Imaging by Carl Zeiss®. The scans were carried out with 4× and 20× objectives. For a 4× scan, the instrument was setup with 40 kV and 3 W, FOV 3208.6 μm, pixel size 3.1831 μm and exposure time 1 s. For a 20× scan, the instrument was setup with 100 kV and 9 W, FOV 507.27 μm, pixel size 0.5114 μm and exposure time 20 s.
Sandstone framework grains are sub-angular to sub-rounded and moderately-sorted in all samples (Fig. 2). Most quartz grains are monocrystalline exhibiting undulose extinction. However, polycrystalline quartz grains with tectonic fabric (classified here as lithic fragments) also occur. K-feldspar dominates over plagioclase feldspar in most sandstones. Both types of feldspar are replaced by cement, especially in samples of the Jhumara and Jhuran Formations. However, replacement of plagioclase feldspar by cement is more extensive (Fig. 2b and c). Aphanitic lithic fragments include polycrystalline quartz with distinct metamorphic fabric (Fig. 2d). Silica overgrowth on quartz is common in many samples, particularly in samples of the Jhuran Formation. Majority of the silica overgrowths are abraded. Two types of cements have been identified using polarizing microscope, namely carbonate and zeolite.
Sandstones of Jhumara, Jhuran and Bhuj Formations are quartzofeldspathic in composition, with mean compositions of Q54F44L2, Q57F41L2 and Q59F39L2 respectively. The number of grains of quartz, feldspar and rock fragments are recalculated to 100 (Table 2) and plotted in triangular QFR plot (Fig. 3). All samples plot within the field of “arkose” except one sample of Bhuj Formation which plots in the field of “subarkose” (Folk 1974). Samples of the Jhumara Formation exhibit the largest spread of data points. Most of the data of Jhuran Formation overlaps with Bhuj Formation while a few data points of the lower part of Jhuran Formation overlap with data points of Jhumara Formation. Data points of the Bhuj Formation exhibit a shift in composition from arkosic to subarkosic.
Recalculated modal sandstone composition data in Table 2 are plotted in QFL plot with superimposed fields of Dickinson et al. (1983) (Fig. 4). Most samples of all the three formations plot in the field representing transitional continental provenance. A few samples of the Jhumara and Jhuran Formations plot in the field representing basement uplifted provenance.
In addition to gross composition of sandstones, a specific geochemical analysis of the heavy mineral assemblages was carried out. Heavy minerals are common in samples of all three formations. Thin section study of sandstones reveals that, the most common transparent heavy mineral species in the sandstones are zircon, rutile, tourmaline, garnet and monazite in order of decreasing abundance, and less commmon heavy minerals include epidote, apatite and chloritoid (Fig. 5). Sandstone thin sections and heavy minerals separated using heavy liquid reveal that almost all zircon grains are prismatic with sub-rounded to well-rounded terminations indicating a polycyclic origin (Figs. 5a and 6c). Tourmaline occurs as both sub-rounded (Fig. 5c) and with prismatic crystal habit (Fig. 6e). Rutile grains show angular shapes (Figs. 5b, 6c and d). Garnet shows variation from angular to rounded shapes (Figs. 5d, 6a and b). A few other grains that were identified are epidote and chloritoid (Fig. 6f). Textures of these detrital species do not show chemical etching or replacement by carbonate cementation. Separated heavy minerals were used for the calculation of Zircon–Tourmaline–Rutile (ZTR) index (e.g., Hubert 1962). The average of the calculated ZTR indices (Hubert 1962) for Jhumara, Jhuran and Bhuj Formations are 25, 30 and 50%, respectively, suggesting a low to moderate mineralogical maturity of the heavy mineral assemblage.
Chemical analysis of opaque heavy minerals reveals abundance of ilmenite in the studied samples. Less common opaque grains include pyrite, hematite and magnetite. Ilmenites in Jhumara Formation contain 57.78% TiO2, 3.56% MnO and 0.22% MgO on average (Table 3). Ilmenites in Jhuran and Bhuj Formations contain 57.72% TiO2, 1.02% MnO, 0.30% MgO, and 64.41% TiO2, 0.38% MnO, 0.28% MgO, respectively. Presence of > 50% TiO2, > 2% MnO, and < 0.5% MgO indicates a mixed felsic igneous and metabasic source for the Jhumara Formation (Basu and Molinaroli 1989; Grigsby 1992). Enriched TiO2 content (> 50%) and depleted MnO content (< 2%) in ilmenite grains of Jhuran and Bhuj Formations indicate metabasic provenance lithotype in the hinterland for these sediments.
Garnet is rarely identified in Jhumara Formation, while it is abundant in samples of Jhuran and Bhuj Formations. The compositional data of garnets in sandstones of all three formations reveal a dominance of almandine (Fe-rich) over other varietal species of the same mineral group (Tables 4, 5 and 6) indicating mafic input. The data for the elements Fe + Mn, Mg and Ca from electron probe microanalysis (EPMA) are normalized to 100 and plotted on a triangular Fe + Mn–Mg–Ca plot of Mange and Morton (2007) (Fig. 7). The analyzed garnets plot in the “Type Ci” field, indicating a source from high grade metabasic rocks (Mange and Morton 2007).
X-ray microscopic investigations
A number of projections were produced from X-Ray microscopy scans which were then processed in Zeiss XM reconstructor and analyzed in ORS Visual software. The total sample volume was segmented into different components viz. volume of pores, volume of cement and volume of detrital grains on the basis of intensity (/density) ranges of each constituent phase. Each of these components were assigned a specific colour for distinction.
Figure 8 shows a three-dimensional view of a sample of Jhuran sandstone. Figure 8a exclusively reveals the densest mineral phases, while Fig. 8d shows each constituents. Heavy minerals appear as dark green in Fig. 8a. Petrographic and EPMA data of this sample indicate three distinguishable grain-size ranges of heavy minerals. The smallest size range of heavy minerals include zircon, tourmaline, apatite and garnet. Rutile occupies the intermediate size range, while ilmenite represents the largest grains. In Fig. 8b, the light green shade indicates carbonate cement. Density contrast is reduced to reveal the lighter framework grains of the sample. Thus quartz and feldspar (with similar density range) appear as pink shades in Fig. 8c. The density contrast is further reduced to indicate lighter phases than framework grains. Zeolite cement, the least dense phase in this sample appears as brown colour in Fig. 8d. The surface of framework grains appear pitted (with green and brown colour) as a result of replacement of grains by cements. The average volume of heavy minerals calculated using data from these scans are 3%, 5.26% and 3.44% for Jhumara, Jhuran and Bhuj Formations, respectively.
The Mesozoic Kutch Basin with southwesterly palaeoslope was bounded by two prominent highs, the Nagar Parkar Uplift to the north (formed as one of the horsts of the rift basin) and the Aravalli Highlands to the east (Fig. 1a). Most of the studied siliciclastic sediments were possibly sourced from these two highs. The QFL plot reveals the basement uplifted provenance for the arenite samples of Middle Jurassic Jhumara Formation (Fig. 4). Possibly, most of the sediments are supplied from the Nagar Parkar Uplift comprising rocks of Nagar Parkar igneous complex. Samples of Upper Jurassic Jhuran Formation and Lower Cretaceous Bhuj Formation indicate transitional continental provenance signatures. This is attributed to a mixture of sediment supplies from rocks of the Nagar Parkar Uplift (basement uplifted source) and the Aravalli Highlands (cratonic source). Thus, upliftment along the Kutch Mainland Fault in the Early Cretaceous (Biswas 2005) possibly had a major impact on sediment transportation paths in the Kutch Mainland.
The Nagar Parkar igneous complex comprises the Late Proterozoic granites, rhyolites, acidic and basic dykes (Ahmad and Chaudhry 2008; Laghari et al. 2013). These rocks were uplifted and exposed by the Nagar Parker Fault in the Early Jurassic. The highlands formed by the rocks of the Proterozoic Aravalli and Delhi Supergroups in the east expose various grades of metasedimentary rocks, granite gneisses and metabasic dikes (Ramakrishnan and Vaidyanadhan 2008). In the studied samples, presence of abraded silica overgrowth and well-rounded zircons in samples of all three formations indicate a reworked polycyclic origin of detrital grains. Chemistry of ilmenites in the Middle Jurassic Jhumara Formation indicates its derivation from a mixed sediment source of felsic igneous and metabasic rocks. Ilmenites in the Upper Jurassic Jhuran Formation and Lower Cretaceous Bhuj Formation are sourced from metabasic rocks. Metabasic rocks are absent in the Nagar Parkar igneous complex. Thus, chemistry of ilmenites in the sediments of the Late Jurassic and Early Cretaceous suggests its derivation from the east. Elemental chemistry of garnets in all three formations further reveals a metabasic source rock provenance. This shift in sediment supply possibly relates to the upliftment along the Kutch Mainland Fault in the Early Cretaceous, blocking sediment supply from north.
High relief and rapid erosion of fault-bounded basement uplifts result in sandstones of typical arkosic composition in the nearby basins (Dickinson 1985; Dickinson and Suczek 1979). Low relief of cratons and prolonged transport of sediments through continental regions of low relief result in quartzose sands (Dickinson and Suczek 1979). QFL detrital modes indicate a shift of sandstone type from arkosic (in Middle Jurassic Jhumara Formation) to subarkosic (in Lower Cretaceous Bhuj Formation). Sandstones further exhibit a change in ZTR index from 25 to 50% through intermediate values, which records increasing tectonic stability. A climatic shift from arid to humid conditions can make a similar mineralogical change from arkosic to sub-arkosic nature of sandstones. The Kutch Basin records a transition from syn-rift to post-rift and therefore the compositional shift of sandstone may be attributed to tectonic stability of a rift basin.
The major conclusions of the study on the Mesozoic sandstones of Kutch Basin are as follows.
The two main sediment sources of the Kutch Mainland include the predominantly felsic basement rocks of Nagar Parkar igneous complex in the north and the Proterozoic Aravalli and Delhi Supergroups in the east.
QFL plot indicates a primarily basement-uplifted provenance for the Middle Jurassic Jhumara Formation and a mixture of basement-uplifted and cratonic-interior provenance for rocks of the Upper Jurassic Jhuran Formation and Lower Cretaceous Bhuj Formation. The change in composition of sandstones from arkose in syn-rift sediments to sub-arkose post-rift sediments supports the increasing tectonic stability of the basin.
Ilmenites in the Middle Jurassic derived from both north and east, while those in the Late Jurassic to Early Cretaceous sediments relate to easterly highlands. Garnet chemistry relates to high-grade metabasic source during the deposition of sediments from Middle Jurassic to Early Cretaceous.
The present investigation points to predominant sediment source from eastern highlands during the late syn-rift to post-rift stage. This may possibly be related to upliftment along the Kutch Mainland Fault, which prevented sediment supply from north in the Kutch Mainland.
X-ray microscopy reveals 3-D distribution of heavy minerals in rock samples. The high content of heavy minerals in the Jhuran Formation indicates high-degree reworking of sediments.
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Authors are indebted to Indian Institute of Technology Bombay for infrastructure facilities. Santanu Banerjee is thankful to Department of Science and Technology, Government of India for financial support through grant SR/S4/ES-709/2014. Authors are thankful to S.C. Patel and Javed M. Shaikh for providing analytical support at the DST-IITB National facility for EPMA, Department of Earth Sciences, Indian Institute of Technology Bombay. Authors are also grateful to George Mathew for facilitating heavy mineral study.
The authors declare that they have no competing interests.
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