西藏拉萨地块东部尼木—加查地区林子宗群火山岩年代学、地球化学特征及其构造意义
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摘要
拉萨地块广泛分布中—新生代岩浆活动,研究其对于认识新特提斯洋的演化和理解整个青藏高原的形成过程有着重要意义。对拉萨地块东部尼木—加查地区比马组火山岩进行了年代学与元素地球化学研究,结果显示该比马组火山岩LA-ICP-MS锆石U-Pb年龄为55. 2～57. 6 Ma,明显晚于已发表的比马组火山岩年龄177～195 Ma,而与林子宗群火山岩年龄(30. 4～70. 0 Ma)相符。因此,该地区原来认为的比马组火山岩可能需要重新厘定为林子宗群年波组火山岩。研究区火山岩主体为玄武岩、玄武安山岩、安山岩和英安岩,属中、高钾钙碱性系列。地球化学特征显示火山岩整体上富集大离子亲石元素Rb、Th、U等,Nb、Ta、Zr、Ti等高场强元素则表现明显的负异常,具有典型的岛弧火山岩特征。稀土元素配分模式主要表现为轻稀土元素右倾型,Eu表现出无异常到中等的负异常。此外,研究区年波组火山岩年龄晚于拉萨地块中西部年波组形成时代,结合前人的研究成果,可能指示印度与亚洲大陆的碰撞具有西早东晚的特点。
Lhasa block is featured by extensive Mesozoic-Cenozoic magmatism,which is important for understanding the Neo-Tethyan evolution and the tectonic history of the Tibetan plateau. In this paper,LA-ICP-MS zircon U-Pb dating and whole-rock geochemical analyses of the Bima Formation volcanic rocks in the NimuJiacha area( eastern Lhasa block) were carried out. Zircon U-Pb ages of the Bima Formation volcanic rock are about 55. 2-57. 6 Ma,which are significantly younger than the published Pima volcanic rock age of 177-195 Ma,and are coeval with the Linzizong Group volcanic rocks( 30. 4-70. 0 Ma). Accordingly,the Bima Formation that was originally thought to be in the area should be redefined as Nianbo Formation of the Linzizong Group. The main volcanic rocks in the study area are basalt,basaltic andesite,andesite and dacite,belonging to the middle-to high-K calc-alkaline series. The volcanic rocks are enriched in LILEs( e. g.,Rb,Th,U) and show clear negative anomalies of HFSEs( e. g.,Nb,Ta,Zr,Ti),with typical island arc geochemical affinities. The REE patterns reveal LREE enrichments,and no or moderately-negative Eu anomaly. In addition,the Nianbo Formation volcanic rocks in the study area are younger than the Nianbo Formation in the middle-western Lhasa block. Combined with published information,it is indicated that the India-Asia collision progressed from west to east.
Lhasa block is featured by extensive Mesozoic-Cenozoic magmatism,which is important for understanding the Neo-Tethyan evolution and the tectonic history of the Tibetan plateau. In this paper,LA-ICP-MS zircon U-Pb dating and whole-rock geochemical analyses of the Bima Formation volcanic rocks in the NimuJiacha area( eastern Lhasa block) were carried out. Zircon U-Pb ages of the Bima Formation volcanic rock are about 55. 2-57. 6 Ma,which are significantly younger than the published Pima volcanic rock age of 177-195 Ma,and are coeval with the Linzizong Group volcanic rocks( 30. 4-70. 0 Ma). Accordingly,the Bima Formation that was originally thought to be in the area should be redefined as Nianbo Formation of the Linzizong Group. The main volcanic rocks in the study area are basalt,basaltic andesite,andesite and dacite,belonging to the middle-to high-K calc-alkaline series. The volcanic rocks are enriched in LILEs( e. g.,Rb,Th,U) and show clear negative anomalies of HFSEs( e. g.,Nb,Ta,Zr,Ti),with typical island arc geochemical affinities. The REE patterns reveal LREE enrichments,and no or moderately-negative Eu anomaly. In addition,the Nianbo Formation volcanic rocks in the study area are younger than the Nianbo Formation in the middle-western Lhasa block. Combined with published information,it is indicated that the India-Asia collision progressed from west to east.
引文
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