Petrographic and geochemical perspectives on sandstones of the extra-peninsular Gondwana Group from the Arunachal Himalayas, NE India: Probing provenance, tectonic context and paleoenvironmental conditions

IF 1.3 4区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Acta Geochimica Pub Date : 2025-04-02 DOI:10.1007/s11631-025-00771-0

Yadav Krishna Gogoi, Pradip Borgohain, Diganta Bhuyan, Devojit Bezbaruah, Garima Konwar, Manash Pratim Gogoi, Bubul Bharali

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Abstract

The extra-peninsular Gondwana Group rocks are exposed in narrow patches within the Lesser Himalayan sequence of the NE-Arunachal Himalayas, India. The bulk of sediments for the sandstones of the Gondwana Group were derived from felsic/acidic to intermediate igneous rocks, with minor mafic input from the upper continental crust (UCC), as supported by various discrimination diagrams based on quantification of detrital minerals coupled with sandstone geochemistry. The inputs from metamorphic sources in subordinate amounts cannot be ruled out, as indicated by quantification of the quartz varieties. These sediments were found to be sourced from the interior part of a craton or shield and recycled platformal sediments which were derived from both passive and active margin settings. The sediments experienced a wide variance in climatic conditions, from arid to humid, suffering low–moderate-intensity weathering (CIA: 63.43; CIW: 86.18; WIP: 44.84; PIA: 75.37; ICV: 2.39; C-value: 0.42; PF: 0.49; Sr/Cu: 9.23 and Rb/Sr: 1.68) within the vicinity of the low plains to moderate hills. Additionally, redox-sensitive elements indicate the deposition of sediments under oxygenated or oxygen-rich conditions (U_au: −2.91; Th/U: 7.37; U/Th: 0.18; V/Cr: 1.71; δU: 0.67 and Ce/Ce*: 0.93).

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冈瓦纳群砂岩沉积物主要来自长英质/酸性至中火成岩，少量基性岩输入来自上大陆地壳（UCC），基于碎屑矿物定量和砂岩地球化学的各种判别图支持了冈瓦纳群砂岩沉积物。石英品种的定量表明，不能排除变质源的次级输入。这些沉积物来自于克拉通或盾体内部，以及来自被动和主动边缘环境的台地沉积物。沉积物气候条件变化较大，从干旱到潮湿，在低平原到中等山丘附近经历了中低强度风化（CIA: 63.43, CIW: 86.18, WIP: 44.84, PIA: 75.37, ICV: 2.39， c值：0.42,PF: 0.49, Sr/Cu: 9.23, Rb/Sr: 1.68）。此外，氧化还原敏感元素表明沉积物在富氧或富氧条件下沉积（Uau:−2.91,Th/U: 7.37, U/Th: 0.18, V/Cr: 1.71, δU: 0.67, Ce/Ce*: 0.93）。

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来源期刊

Acta Geochimica GEOCHEMISTRY & GEOPHYSICS-

CiteScore

2.80

自引率

6.20%

发文量

1134

期刊介绍： Acta Geochimica serves as the international forum for essential research on geochemistry, the science that uses the tools and principles of chemistry to explain the mechanisms behind major geological systems such as the Earth‘s crust, its oceans and the entire Solar System, as well as a number of processes including mantle convection, the formation of planets and the origins of granite and basalt. The journal focuses on, but is not limited to the following aspects: • Cosmochemistry • Mantle Geochemistry • Ore-deposit Geochemistry • Organic Geochemistry • Environmental Geochemistry • Computational Geochemistry • Isotope Geochemistry • NanoGeochemistry All research articles published in this journal have undergone rigorous peer review. In addition to original research articles, Acta Geochimica publishes reviews and short communications, aiming to rapidly disseminate the research results of timely interest, and comprehensive reviews of emerging topics in all the areas of geochemistry.