Early Mesoproterozoic (1.6–1.5 Ga) granulite facies events in the Ongole domain: geodynamic significance and global correlation

Early Mesoproterozoic (1.6–1.5 Ga) granulite facies events in the Ongole domain: geodynamic significance and global correlation
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Ongole 域早中元古代 (1 6â1 5 Ga) 麻粒岩相事件:地球动力学意义和全球相关性

DOI:
10.1111/jmg.12207
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发表时间:
2016
影响因子:
3.4
通讯作者:
Schenk
Schenk
中科院分区:
地球科学1区
文献类型:
--
作者:
Sarkar;Schenk

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印度东南部东高止带晚古元古代至中元古代早期的Ongole域由一套含变质长粒岩和基性麻粒岩包体的charnoenenter岩体组成。所有变火成岩的地球化学数据都是典型的大陆岩浆弧套。岩石保存了矿物组合和反应结构,表明了两个独立的变质事件:一个初始的逆时针中压超高温(MP - UHT)事件(bbb900°C, 6.5-7.0 kbar),归因于弧的岩浆增生,随后是一个顺时针的HP - MT事件(~700°C, 9 kbar),归因于其构造地壳增厚。charnoender岩体锆石定年结果显示岩浆结晶年龄在1.75 ~ 1.70 Ga之间,变质年龄在1.62 ~ 1.60 Ga之间。同变质岩产岩浆锆石和变质锆石。1.60 Ga,与其他所有变质边缘年龄重叠。相比之下,对两代化学性质不同的独居石进行结构控制的定年,揭示了两个变质事件。1.62并且。着1.54 Ga。这些资料表明,Ongole域形成于古元古代(1.75 ~ 1.70 Ga)的岩浆弧,随后经历了UHT变质作用,并伴有同步变质侵入作用。1.60 Ga,岩浆底板为变质热源。随后的地壳增厚。1.54 Ga是由于Ongole岩浆弧与印度克拉通的碰撞。乌戈勒域的UHT变质作用及其造山作用处于假定的晚古元古代至晚中元古代“造山- UHT时间间隙”(1.8-1.1 Ga),一些研究认为这是古元古代超大陆(哥伦比亚或努纳)形成后的造山静止期。2.1 - -1.8 Ga。同时期造山作用。1.7-1.5 Ga发生在哥伦比亚(印度、澳大利亚、南极洲和非洲西南部)不同碎片的增生边缘,表明这个超大陆的形成是一个漫长的过程。
The late Palaeoproterozoic to early Mesoproterozoic Ongole domain of the Eastern Ghats Belt in southeastern India is composed of a suite of charnoenderbites with enclaves of metapelitic and mafic granulites. Geochemical data for all meta‐igneous rocks are typical for continental magmatic arc suites. The rocks preserve mineral assemblages and reaction textures indicating two separate metamorphic events: an initial counter‐clockwise medium‐pressure ultrahigh temperature (MP−UHT) event (>900 °C at 6.5–7.0 kbar), attributed to the magmatic accretion of the arc, which was followed by a clockwise HP‐MT event (~700 °C at 9 kbar), attributed to its tectonic crustal thickening. Zircon dating of charnoenderbites yield magmatic crystallization ages between 1.75 and 1.70 Ga and metamorphic ages between 1.62 and 1.60 Ga. Syn‐metamorphic enderbites yield magmatic and metamorphic zircon ages ofc. 1.60 Ga, overlapping with all other metamorphic rim ages. In contrast, texturally controlled monazite dating of two chemically distinct monazite generations reveals two metamorphic events atc. 1.62 andc. 1.54 Ga. These data suggest that the Ongole domain was formed as a magmatic arc during the Palaeoproterozoic (c. 1.75–1.70 Ga), and subsequently experienced UHT metamorphism accompanied by syn‐metamorphic intrusions atc. 1.60 Ga, suggesting magmatic underplating as the metamorphic heat source. The subsequent crustal thickening atc. 1.54 Ga was due to the collision of the Ongole magmatic arc with the Indian craton. The UHT metamorphism and the related orogenic processes of the Ongole domain fall into the assumed late Palaeoproterozoic to late Mesoproterozoic ‘orogenic and UHT time gap’ (1.8–1.1 Ga) regarded by some studies as an orogenic quiescent period after the formation of the Palaeoproterozoic supercontinent known as Columbia or Nuna atc. 2.1–1.8 Ga. Coeval orogenic processes atc. 1.7–1.5 Ga occurring along accretionary margins in different fragments of Columbia (India, Australia, Antarctica and southwest Africa) indicate a protracted formation of this supercontinent.
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