Study on the geochemical characteristics of ocean-ridge and oceanic-island volcanic rocks in the Nan-Uttaradit zone,northern Thailand |
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Authors: | Shangyue Shen Qinglai Feng Wenqiang Yang Zhibin Zhang Chong pom Chong lakmani |
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Institution: | [1]State Key Laboratory of GPMR, China University of Geology, Wuhan 430074, China [2]Institute of Regional Geology, Yunnan Bureau of Geology and Mineral Resources, Yuxi 653110, China [3]Suranaree University of Technology, Thailand |
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Abstract: | Field investigations and laboratory integrated research as indicated that ophiolite mélange in the Nan-Uttaradit zone, northern Thailand, consists of fragments of tectonites such as metamorphic peridotite (extremely silicified serpentinite), cumulates (pyroxenolite, gabbro, and gabbro-diorite), ocean-ridge basalt, oceanic-island basalt and radiolarian silicalite, and it was formed during D3-P. The rock series, rock types and petrogeochemical characteristics of metamorphic tholeiites in the Nan area of the Nan-Uttaradit zone are similar to those of ocean-ridge basalts (C1) in China's Ailaoshan zone. As for the Hawaiites in the Nan area of the Nan-Uttaradit zone, their major elements, REEs and trace elements are similar to those of oceanic-island basalts in China's Jinshanjiang zone (P11). In the Uttaradit area of this zone the metamorphic alkaline basalts show transitional petrogeochemical characteristics between ocean-ridge basalts and oceanic-island basalts, which were still formed in oceanic-island environments. The above-described basalts are all oceanic volcanic rocks and they are the most important part of the Paleo-Tethys oceanic crust in the Nan-Uttaradit zone. |
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Keywords: | Nan-Uttaradit zone northern Thailand China's Ailaoshan and Jinshajiang zones ocean-ridge and oceanic islandbasalts geochemical characteristic |
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