Transition from vertical to horizontal tectonic regime during the Paleoarchean-Mesoarchean: Evidence from mafic-ultramafic rocks of the Holenarsipur Greenstone Belt, Western Dharwar Craton, Southern India

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2024-07-24 DOI:10.1016/j.precamres.2024.107492

Arathi G. Panicker , M. Ram Mohan , Ravi Shankar

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Abstract

The Dharwar Craton (DC) in southern India is one of the classic Archean terrains, preserving an evolutionary history from the Paleoarchean to Mesoarchean. The present study attempts to understand the origin and evolution of mafic (amphibolites) and ultramafic (harzburgite) rocks from the Holenarsipur Greenstone Belt (HGB), to decipher the evolution of the cratonic core of the Western Dharwar Craton (WDC). Relict olivine and orthopyroxene pseudomorphs and Neodymium isotopic compositions reveal that harzburgites from the HGB represent a preserved section of the early Archean mantle, re-fertilized by fluid/rock interaction during serpentinization. The ultramafic and mafic rocks from the southern and northern parts of the belt exhibit coherent whole-rock geochemical and Nd isotopic compositions. Ultramafic rocks were derived from a depleted mantle source (ƐNd_(t=3300)= +0.65 to +8.70) while, the amphibolites were generated by partial melting of an enriched mantle source (ƐNd_(t=3300) = -4.16 to +0.92). The ultramafic rocks with fore-arc affinity may signify the prevalence of a subduction setting during the early stages of the first accretionary event in the WDC. The compositionally uniform mafic rocks from the HGB with oceanic plateau affinity affirm a plume environment. Our study establishes the prevalence and transition from vertical to horizontal tectonics during the Paleoarchean-Mesoarchean evolution of the WDC.

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古新统-中新统时期从垂直构造到水平构造的过渡：印度南部西达尔瓦克拉通霍伦纳西布尔绿岩带黑云母-超黑云母岩石的证据

印度南部的达尔沃克拉通（Dharwar Craton，DC）是典型的阿凯岩地形之一，保留了从古新世到中新世的演化历史。本研究试图了解霍勒纳尔斯普尔绿岩带（Holenarsipur Greenstone Belt，HGB）中的黑云母岩（闪长岩）和超黑云母岩（哈兹堡岩）的起源和演化，以破译西达尔沃克拉通（Western Dharwar Craton，WDC）的克拉通核心的演化过程。相对橄榄石和正长石假象以及钕同位素组成显示，来自霍伦西布尔绿岩带的哈兹伯格岩代表了早阿新世地幔的一个保留部分，在蛇绿岩化过程中通过流体/岩石相互作用而重新肥沃起来。岩带南部和北部的超基性岩和黑云母岩显示出一致的全岩地球化学和钕同位素组成。超基性岩源自贫化地幔源（ƐNd(t=3300)= +0.65 至 +8.70），而闪长岩则由富化地幔源部分熔融而成（ƐNd(t=3300) = -4.16 至 +0.92）。具有前弧亲缘关系的超基性岩可能表明，在西部断裂带第一次增生事件的早期阶段，俯冲环境十分普遍。来自HGB的成分均匀的岩浆岩与大洋高原的亲缘关系肯定了羽流环境。我们的研究证实了在古新世-中新世演化过程中西大洋中心的垂直构造普遍存在并向水平构造过渡。

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来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.