MESOZOIC-CENOZOIC TECTONIC MAGMATIC PORTFOLIO ANALYSIS IN CUOQIN AREA OF THE MIDDLE GANGDISE
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摘要: 在新一轮1:25万区域地质调查成果的基础上, 根据研究区岩浆岩的时空分布、产状、岩石学和地球化学特征以及形成的构造环境, 将其划分为6种岩石构造组合：①弧间扩张型组合; ②洋岛型蛇绿岩组合; ③岛弧与陆缘弧型组合; ④碰撞型组合; ⑤陆内俯冲、碰撞型组合; ⑥陆内拉张型组合.进而对构造岩浆组合的地球动力学机制进行了剖析, 尤其是对喜马拉雅中期的岩浆作用进行了深入探讨; 提出了冈底斯构造岩浆带是由俯冲型、碰撞型和隆升型岩浆岩组合成的复合体, 它们在空间上明显分带, 在时间上呈现由相对基性向酸性的演化趋势和规律.Abstract: On the basis of 1:250000 regional geological mapping in the blank areas of the Qinghai-Tibet Plateau, the magmatic rocks in Cuoqin area are divided into six kinds of petrotectonic assemblage through their time-spatial distribution, occurrence, petrology, geochemistry and tectonic settings as follows: (1) the combination of inter-arc dilated, (2) the Oceanic-island ophiolite portfolio, (3) the portfolio of island and margin arcs, (4) the combination of collision-type, (5) the inland subduction and collision-type combination, and (6) the intracontinental extensional type combination. Then, the geodynamic mechanism of tectono-magmatic portfolios, especially the mid-Himalayan magmatism, is discussed. It is proposed that the Gangdise tectono-magmatic belt is comprised by the subduction-, collision- and uplift-type magmatic rocks clearly zoned in space and evolution from base to acidic in time.
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Key words:
- petrotectonic assemblage /
- Gangdise tectono-magmatic belt /
- Mesozoic and Cenozoic /
- Cuoqin /
- Tibet
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图 1 蛇绿岩地质剖面
1.砂岩; 2.放射虫硅质岩; 3.均质辉长岩; 4.堆晶辉长质; 5.席状岩墙; 6.蛇纹岩; 7.基性熔岩; 8.硅质板岩; 9.绿片岩; 10.构造混杂岩; 11.强变形带; 12.断层
Figure 1. Geological profile of ophiolite suite
图 4 花岗闪长岩(K1γδ2)与二长花岗岩呈脉动接触
Figure 4. Pulsed contact between granodiorite (K1γδ2)and monzonitic
图 5 石英闪长岩与下拉灰岩侵入接触素描图
1.白云岩; 2.白云质大理岩; 3.透灰石矽卡岩; 4.方柱石矽卡岩
Figure 5. Sketch of intrusive contact between quartz diorite and limestone
图 8 第四纪火山岩覆盖于湖积物之上
Figure 8. Lacustrine deposits overlaid by Quaternary volcanic rocks
图 9 MgO/Al2O3-压力与矿物组合关系
MgO/Al2O3为WB %比值(据French, etc, 1981)
Figure 9. MgO/Al2O3 vs pressure diagram
表 1 冈底斯中段措勤地区岩浆作用与区域构造演化的关系[5]
Table 1. Relation of Magma Generation and Tectonic Evolution in Cuoqin Area of middle segment of Mt.Gangdise
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