Evolution and tectonic setting of the Malani – Nagarparkar Igneous Suite: A Neoproterozoic Silicic-dominated Large Igneous Province in NW India-SE Pakistan

Wall, Heinrich de; Pandit, Manoj K.; Donhauser, Ines; Schöbel, Stefan; Wang, Wei; Sharma, Kamal Kant

doi:10.1016/j.jseaes.2018.04.016

Cited by 58 publications

(18 citation statements)

References 97 publications

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“…The comparison with age data for the MIS (figure 4) (Deb et al 2001;Konopelko et al 2007;Gregory et al 2009;Dharma Rao et al 2012;Purohit et al 2012;Arora et al 2017) supports the model of separate magmatic events. Magmatic rocks of both these age groups have also been identified in Nagarparkar of SE Pakistan (Khan et al 2012;Jan et al 2014Jan et al , 2017, in Madagascar (Archibald et al 2016) and in South China (Wang et al 2010;Zhang and Zheng 2013) and have been related to the Neoproterozoic rifting of the continental crust along the periphery of the Rodinia supercontinent (Li et al 2010;de Wall et al 2018).…”

Section: Geological Settingmentioning

confidence: 98%

Differences in natural gamma radiation characteristics of Erinpura and Malani granites in NW India

et al. 2019

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In NW India, large volumes of exposed Neoproterozoic basement rocks are formed by two magmatic suites, Erinpura granites as a late thermal event with respect to the ∼1 Ga Delhi Orogeny and the younger Malani igneous suite (770-750 Ma). Average uranium and thorium equivalent concentrations (in ppm) inferred from spectroscopic gamma radiation survey are higher in Malani rocks (Th 47.33 ppm and U 6.95 ppm) as compared to the Erinpura granites (Th 33.55 ppm and U 4.77 ppm). These values are considerably above the granite world average (Th 14.8 ± 13.2 ppm; U 3.93 ± 3.27 ppm). High U (up to 19 ppm) and Th (up to 88 ppm) in some Malani granites and a constant Th-U ratio of 7 points to a high degree of fractionation of the felsic magma. Higher radioelement concentration in the east (Mirpur granite) as compared to the west (Jaswantpura granite) is substantiated by geochemical data. Areas to the west and east of the Sirohi frontal thrust show differences, most likely a consequence of anatexis in the eastern sector. A high linear correlation between inductively coupled plasma mass spectrometry and gamma-ray data underlines the suitability of in-situ measurements for the determination of U and Th concentrations during a field survey providing basic information for future petrogenetic and risk-hazard studies in this granitic terrain.

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Section: Geological Settingmentioning

confidence: 98%

Differences in natural gamma radiation characteristics of Erinpura and Malani granites in NW India

et al. 2019

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“…A-type granites (Loiselle and Wones 1979;Eby 1992) are typical of intra-plate, often anorogenic settings. They are the most abundant in Proterozoic terranes, such as the Malani Igneous suite in NW India (Eby and Kochhar 1990;de Wall et al 2018), and are characterized by generally high radioelement concentrations (Scharfenberg et al 2015(Scharfenberg et al , 2019 resulting in higher RHP (Singh and Vallinayagam 2012). Therefore A-type granites commonly rank to high-heat-producing granites (HHP granites).…”

Section: Heat-producing Classification and Comparison With Other Granmentioning

confidence: 99%

Radiogenic heat production of Variscan granites from the Western Bohemian Massif, Germany

Scharfenberg¹,

Regelous²,

Wall³

2020

Jour. Geosci.

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Much of the Mid-European basement has been consolidated during the Variscan Orogeny and includes large volumes of granitic intrusions. Gamma radiation spectroscopic measurements in three study areas along the western margin of the Bohemian Massif give a record of radiogenic element concentrations in the Variscan granites. Most intrusions of the Fichtelgebirge (except for the Tin Granite) and intrusive complexes in the Bavarian Forest show Th/U ratios exceeding unity, most likely related to abundance of monazite. In contrast, some of the Oberpfalz granites located near the Saxothuringian-Moldanubian boundary (Flossenbürg, Steinwald and Friedenfels types) are characterized by higher uranium concentrations and thus Th/U < 1. The low Th/U ratios here are in agreement with a possible U mobilisation along the Saxothuringian-Moldanubian contact zone observed in previous studies. Heat production rates of granites in the three study areas vary between 3.9 and 8.9 µW/m 3 , with a mean of 4.9 µW/m 3. This classifies the intrusions as moderate-to high-heat-producing granites. Considering the huge volume of granitic bodies in the Variscan crust of the Bohemian Massif, the contribution of in situ radiogenic heat production had to have a major impact and should be considered in further thermal modeling.

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“…The type C garnets are classified as type Ci and Cii where the first variety occurs in high-grade metabasic rocks, and the second variety indicates ultramafic rocks (e.g., pyroxenites and peridotites) (Mange & Morton, 2007). On the other hand, in skarns, metamorphosed calc-silicate granulites and very low-grade metabasics the garnets are Ca-rich, which represent type D garnets (Dasgupta & Pal, 2005;Mange & Morton, 2007). (Henry & Guidotti, 1985).…”

Section: F I G U R E 3 Source Rock Discrimination Based Onmentioning

confidence: 99%

The use of heavy mineral chemistry in reconstructing provenance: A case study from Mesozoic sandstones of Kutch Basin, India

et al. 2020

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Petrography and geochemistry of the Mesozoic sedimentary rocks of the Kutch Basin in western India reveal the predominance of felsic source rocks. Single-grain chemistry of the detrital heavy minerals in these sediments refines the existing provenance interpretations by incorporating additional data related to source lithology. The study presents information on type, composition, and metamorphic grade of the source rocks for the Mesozoics of the Kutch Basin, which comprises Jhurio, Jhumara, Jhuran, and Bhuj formations. Chemistry of rutile, garnet, and tourmaline supports multiple sources of sediments. The ratio between Cr and Nb in rutile suggests the dominance of sediment input from metapelites. The relationship between (Fe + Mn)-Mg-Ca in garnets and CaFe total-Mg in tourmalines indicates the dominance of Ca-poor felsic metamorphic source along with intermediate-acidic plutonic rocks. The multivariate discrimination of the detrital garnets reveals the dominance of granulite and amphibolite facies source rocks. Rutile compositions indicate subordinate inputs from mafic sources across the investigated sedimentary succession. The single-grain analysis of heavy minerals, therefore, infers a wide variation in source rock types.

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Evolution and tectonic setting of the Malani – Nagarparkar Igneous Suite: A Neoproterozoic Silicic-dominated Large Igneous Province in NW India-SE Pakistan

Cited by 58 publications

References 97 publications

Differences in natural gamma radiation characteristics of Erinpura and Malani granites in NW India

Differences in natural gamma radiation characteristics of Erinpura and Malani granites in NW India

Radiogenic heat production of Variscan granites from the Western Bohemian Massif, Germany

The use of heavy mineral chemistry in reconstructing provenance: A case study from Mesozoic sandstones of Kutch Basin, India

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