青藏高原拉萨地块碰撞-后碰撞岩浆作用的三种类型及其对大陆俯冲和成矿作用的启示：Sr-Nd同位素证据

莫宣学[1,2] 赵志丹[1,2] DonJDEPAOLO 周肃[1,4] 董国臣[1,2]

青藏高原拉萨地块碰撞-后碰撞岩浆作用的三种类型及其对大陆俯冲和成矿作用的启示：Sr-Nd同位素证据

莫宣学[1,2] 赵志丹[1,2] DonJDEPAOLO 周肃[1,4] 董国臣[1,2]

- [1]中国地质大学地质过程与矿产资源国家重点实验室,北京100083 [2]中国地质大学地球科学与资源学院,北京100083 [3]伯克利加利福尼亚大学伯克利,CA 94720,美国 [4]中国地质大学地学实验中心,北京100083
基金项目:
国家重点基础研究发展规划项目（编号：2002CB412603）、国家自然科学基金（40473020,40234052,40103003,40503005,40572048）、国土资源部青藏专项计划（200101020401）、中科院广州地化所同位素开放实验室基金、中国地调局综合研究项目和中国国家留学基金资助.

收稿日期: 2005-12-01

修回日期: 2006-03-20

刊出日期: 2006-04-30

Three types of collisional and post-collisional magmatism in the Lhasa block,Tibet and implications for India intra-continental subduction and mineralization:evidence from Sr-Nd isotopes.

MO XuanXue~

- 1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beifing 100083, China ;2. School of Earth Science and Mineral Resources, China University of Geosciences, Beifing 100083, China; 3. University of California, Berkeley, Berkeley, CA 94720, USA; 4. Geological Analysis Center, China University of Geosciences, Beijing 100083, China

Received Date: 01 December 2005

Revised Date: 20 March 2006

Publish Date: 30 April 2006

摘要

摘要: 青藏高原拉萨地块是揭示印度与亚洲大陆碰撞的最重要的地区之一,其中广泛发育的碰撞-后碰撞岩浆作用记录了这一地区从特提斯洋俯冲消减到印度大陆陆内俯冲的全过程.本文基于对最新的Sr-Nd同位素资料的分析,从高原岩石圈的三种主要地球化学端元入手,分析了拉萨地块碰撞-后碰撞岩浆作用的类型及其在大陆俯冲与成矿作用方面的意义.青藏高原岩石圈可以分为三种主要的地球化学端元,一是青藏高原北部地球化学省（包括羌塘、可可西里和西昆仑）代表的青藏原始岩石圈地幔地球化学端元,42Ma以来在高原北部广泛分布的钾质岩浆岩的Nd-Sr同位素成分比较均一和稳定,同位素比值的范围较窄,^87Sr/^86Sr=0.707101～0.710536,εNd=-2～-9,tDM=0.7～1.3Ga;二是雅鲁藏布江蛇绿岩代表的新特提斯洋地幔端元,^87Sr/^86Sr=0.703000～0.706205,εNd=＋7.8～＋10,呈印度洋型MORB特征,属于印度洋型地幔域;三是喜马拉雅带地壳基底和花岗岩类显示的喜马拉雅地壳地球化学端元,εNd=-12～-25,^87Sr/^86Sr=0.733110～0.760000,具相对古老的Nd模式年龄,tDM=1.9～2.9Ga.拉萨地块碰撞-后碰撞岩浆作用可以划分出三种地球化学类型,即拉萨地块原地型、亲特提斯洋型和亲喜马拉雅型.这三种岩浆作用类型受控于上述三种地球化学端元在其源区的比例及相互作用.其中,拉萨地块原地型与青藏高原北部地球化学省特征一致,亲特提斯洋型代表了与新特提斯洋俯冲消减及其后的再循环有关的岩浆作用,亲喜马拉雅型岩浆岩的Sr-Nd同位素特征则可能指示了喜马拉雅大陆地壳端元的参与.超钾质火山岩是揭示印度大陆岩石圈向北俯冲的重要证据,印度大陆岩石圈俯冲作用可能同时控制了超钾质岩石和盐类矿床的产出,古老地壳物质作为源区参与了超钾质岩石和盐类矿床的成岩与成矿作用.拉萨地块中部地区的含矿斑岩属于亲特提斯洋型岩浆作用,因此具亲特提斯洋型特征的火山岩、浅成斑岩和深成侵入岩,是进一步寻找铜、钼、金矿床的重要目标.
- 地球化学端元 /
- 碰撞 /
- 后碰撞 /
- 岩浆作用 /
- Sr-Nd同位素 /
- 拉萨地块 /
- 西藏
- Geochemical component /
- Collisional-posteollisional magmatism /
- Sr-Nd isotopes /
- Lhasa block /
- Tibet /

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青藏高原拉萨地块碰撞-后碰撞岩浆作用的三种类型及其对大陆俯冲和成矿作用的启示：Sr-Nd同位素证据

Three types of collisional and post-collisional magmatism in the Lhasa block,Tibet and implications for India intra-continental subduction and mineralization:evidence from Sr-Nd isotopes.

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