Geochemistry of sedimentary rocks from Permian–Triassic boundary sections of Tethys Himalaya: implications for paleo-weathering, provenance, and tectonic setting

Mir, Akhtar R.; Balaram, V.; Ganai, Javid A.; Dar, Shamim A.; Krishna, A. Keshav

doi:10.1007/s11631-016-0107-5

Cited by 17 publications

(6 citation statements)

References 43 publications

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“…Brookfield et al (2010) analyzed the Platinum Group Elements in 0.3 cm spaced samples from −0.5 to +1.3 m across the boundary, which indicated no abnormal extraterrestrial components. Mir et al (2016) analyzed eight samples for major elements, indicating low to moderate degrees of weathering with little change, and a moderate degree of weathering for plagioclase feldspar, but unfortunately did not give any detailed stratigraphic information, other than formation, so no trends can be proposed. Mir et al (2016) analyzed eight samples for major elements, indicating low to moderate degrees of weathering with little change, and a moderate degree of weathering for plagioclase feldspar, but unfortunately did not give any detailed stratigraphic information, other than formation, so no trends can be proposed.…”

Section: Introductionmentioning

confidence: 99%

“…Kumar et al (2017) analyzed five widely spaced samples from −3 to +6 m across the boundary, which indicated increased weathering, greater reworking, and a change from oxidizing to reducing conditions across the boundary, with a continental crust source. Mir et al (2016) analyzed eight samples for major elements, indicating low to moderate degrees of weathering with little change, and a moderate degree of weathering for plagioclase feldspar, but unfortunately did not give any detailed stratigraphic information, other than formation, so no trends can be proposed.…”

Section: Introductionmentioning

confidence: 99%

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Palaeoenvironments and elemental geochemistry across the marine Permo‐Triassic boundary section, Guryul Ravine (Kashmir, India) and a comparison with other North Indian passive margin sections

Brookfield

Stebbins

Williams

et al. 2019

The Depositional Record

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The Guryul Permian-Triassic sediments were deposited on a passive margin in a partially enclosed basin, at a latitude of about 45°S along the southern margin of the Neotethys Ocean. The closest modern analogy is the Japan Sea rotated into a southern hemisphere orientation. Guryul element variations are subdued, mostly lithological, and take place across the change from the dominantly sandy shallow-water Permian Zewan Formation into the dominantly shaly deeper-water latest Permian-Triassic Khunamuh Formation, and not at the palaeontological Permian-Triassic boundary.The overall geochemistry of the Guryul sediments is very similar to that of the Ulleung Basin in the Japan Sea, where the sediments are 40%-60% eolian from loess and redeposited loess in the North China Basin. The overall Guryul geochemistry indicates that the sediments were derived from dominantly silica-rich continental rather than silica-poor sources although with some more silica-poor inputs at times. Element ratios suggest increasing aridity and wind abrasion across the Permian-Triassic boundary. Various geochemical redox proxies suggest mainly oxic depositional conditions, with episodes of anoxia, but with little systematic variation across the extinction boundary. Productivity proxies suggest a slight decrease across the Permian-Triassic boundary, and at least one more decreased interval in the Early Triassic. The similar geochemistry of other localities indicate that the Guryul geochemical changes are regional in extent and representative of the North Indian Permian-Triassic passive margin. The lack of consistent element geochemical changes across the boundary accompanied by significant C, S, and other isotopic changes suggests that atmospheric and oceanic chemistry rather than physical changes, such as provenance, climate and sea-level changes, drove the Permian-Triassic environmental changes and extinctions at least on the mid-latitude Tethyan shelf of northern India. K E Y W O R D S Extinction, geochemistry, Kashmir, Permian-Triassic 76 | BROOKFIELD Et aL. F I G U R E 1 Late Permian palaeogeography (courtesy of Chris Scotese): Early Triassic "dead zone" from Sun et al. (2012); Winds from Kiehl and Shields (2005). Locations of cited Permo-Triassic boundary section in open circles with names in bold face 78 | BROOKFIELD Et aL. F I G U R E 8 Biostratigraphy of the Guryul Permian-Triassic boundary section showing stratigraphic range of fossils and number of species in each subdivision (data from Nakazawa et al., 1975). Bryo -bryozoans. Gastr -gastropods. Note that there is little extinction at the Zewan-Khunamuh Formation boundary and the main extinction (and new species appearance) is at the FAD of Hindeodus parvus, and the first inferred anoxic level marked by pyrite framboids.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Palaeoenvironments and elemental geochemistry across the marine Permo‐Triassic boundary section, Guryul Ravine (Kashmir, India) and a comparison with other North Indian passive margin sections

Brookfield

Stebbins

Williams

et al. 2019

The Depositional Record

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“…The PTB section at Guryul Ravine, Kashmir, is greater than a hundred meters thick (Algeo et al 2007). Further, conformable succession of mixed siliciclastic-carbonate sediments in the ramp setting of this ravine is apparent (Mir et al 2016). Fig.…”

Section: Guryul -A Geological Treasurementioning

confidence: 91%

Geological treasure of Guryul ravine section in Kashmir Himalaya – a case report

Shah

Farooq²,

Meraj³

et al. 2022

Preprint

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“…Tewari et al, 2015;Brosse et al, 2017), geochronological (e.g. Mir et al, 2016;Brookfield et al, 2020;Sial et al, 2021) or biological aspects (e.g. Joshi and Chauhan, 1982;Joshi, 1983;Mukhopadhyay et al, 2021) and mineral exploration potential (e.g.…”

Section: Introductionmentioning

confidence: 99%

Gullies and badlands of India: Genesis, geomorphology and land management

Majhi

Harris

Evans

et al. 2023

Earth Surf Processes Landf

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Geochemistry of sedimentary rocks from Permian–Triassic boundary sections of Tethys Himalaya: implications for paleo-weathering, provenance, and tectonic setting

Cited by 17 publications

References 43 publications

Palaeoenvironments and elemental geochemistry across the marine Permo‐Triassic boundary section, Guryul Ravine (Kashmir, India) and a comparison with other North Indian passive margin sections

Palaeoenvironments and elemental geochemistry across the marine Permo‐Triassic boundary section, Guryul Ravine (Kashmir, India) and a comparison with other North Indian passive margin sections

Geological treasure of Guryul ravine section in Kashmir Himalaya – a case report

Gullies and badlands of India: Genesis, geomorphology and land management

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