The Central Ailaoshan ophiolite and modern analogs

The Central Ailaoshan ophiolite and modern analogs
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哀牢山中部蛇绿岩及现代类似物

DOI:
10.1016/j.gr.2013.03.004
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发表时间:
2014-07
期刊:
影响因子:
6.1
通讯作者:
Salam Abhisit
Salam Abhisit
中科院分区:
地球科学1区
文献类型:
--
作者:
Lai Chun-Kit;Meffre Sebastien;Crawford Anthony J.;Zaw Khin;Halpin Jacqueline A.;Xue Chuan-Dong;Salam Abhisit

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哀牢山中部蛇绿岩是分隔东南亚大陆华南和印度支那地块的金沙江-哀牢山-松马缝合带的重要构造组分。CAL蛇绿岩是一个复杂的构造带,保存了古特提斯时期曾经广阔的金沙江-哀牢山-松马分支的开合历史。新的和现有的地质资料表明,CAL蛇绿岩含有泥盆纪-第三纪的岩浆岩。冈瓦纳盆地西北缘石炭系(约380 ~ 330 Ma)火山被动边缘破碎发育;(2)二叠纪(约258 Ma)峨眉山大火成岩省相关的大陆裂谷岩浆活动,以及(并侵入)(3)早三叠纪(约244 Ma)大陆-大陆同碰撞s型花岗岩类。CAL的泥盆-石炭系蛇绿岩套与许多大陆边缘型阿尔卑斯特提斯蛇绿岩具有高度可比性。此外,各CAL岩浆岩套具有较强的华南地块亲和性,特别是华南西部地块、金沙江地体、松马地体和松大地体具有同时期岩浆作用。
The Central Ailaoshan (CAL) ophiolite represents an important tectonic component of the Jinshajiang–Ailaoshan–Song Ma suture zone separating the South China and Indochina blocks in the mainland SE Asia. The CAL ophiolite occurs as a complex tectonic mélange, and preserves the history of the opening and closure of the once vast Jinshajiang–Ailaoshan–Song Ma branch of the Paleotethys. New and existing geological data indicate that the CAL ophiolite contains magmatic rocks generated by: (1) L. Devonian–E. Carboniferous (ca. 380–330 Ma) volcanic passive margin-breakup development in the NW Gondwana margin; (2) L. Permian (ca. 258 Ma) Emeishan large igneous province-related continental rift magmatism, together with (and intruded by) (3) earliest M. Triassic (ca. 244 Ma) continent–continent syn-collisional S-type granitoids. The Devono-Carboniferous suites of the CAL ophiolite are highly comparable with many continental margin-type Alpine Tethyan ophiolites. In addition, the various CAL magmatic suites have strong South China block-affinities with coeval magmatism particularly in the western South China block, Jinshajiang-, Song Ma-, and Song Da terranes.
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