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Genesis of Heishibeihu Cenozoic Potassic Volcanic Rocks from Northern Qinghai-Tibetan Plateau, China

详细信息

责任者：Ning Weikun (College of Earth Sciences ; Jilin University ; Changchun 130061 ; China) ; Chi Xiaoguo
刊名：Geological Bulletin of China
出版年：2009
卷期：28(9)
关键词：火山岩 ; volcanic rocks ; 青藏高原 ; Qinghai-Tibetan Plateau
页码：p.1355-1360
图表：6 illus., 2 tables, 18 refs.
分类号：0801
issnNo：ISSN1671-2552
isbnNo：CN11-4648/P

摘要

In this paper, petrological and geochemical characteristics of Heishibeihu potassic volcanic rocks in Kunlun volcanic belt are discussed, and further genesis comparison of the Cenozoic volcanic rocks among Heishibeihu, Kangxiwa and Quanshuigou of west-Kunlun area are made. According to research, the K₂O and Na₂O contents of basaltic rocks of Kunlun volcanic belt vary largely, from sodic to potassic, and all the basaltic magma displays an evolution tendency of potassic latite in TAS diagram. Magmatic source of Heishibeihu volcanic rocks display EMⅡ characteristics in the composition of high field-strength element (HFSE) and Sr, Nd isotopic system. The Cenozoic volcanic rocks are intensively enriched in LREE and have strong differentiation in HREE, which indicates the magma was originated form garnet-bearing enriched mantle.

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