滇西点苍山-哀牢山变质岩系变质时限研究
Metamorphic time limits’ study on the metamorphic rocks series of Ailao Shan-Diancang Mountain Ranges, West Yunnan
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摘要: 点苍山-哀牢山变质带沿红河-哀牢山走滑剪切带呈北西-南东向展布,其主体由下元古界苍山群和哀牢山群深变质岩系组成,是滇西最显著的带状变质带之一。点苍山-哀牢山变质带的变质时限和山脉隆升时限由于缺乏精确年代学数据制约,一直存在不同认识。本文选取点苍山花岗闪长质糜棱岩(DCS-1),哀牢山墨江-元江段黑云母花岗闪长质片麻岩(SM07-1)和其侵位的同变形花岗岩脉(SM07-3)以及元江县城西北山前花岗质片麻岩(YJ)作为研究对象,并挑选出锆石颗粒(SM07-3)、黑云母(SM07-1-Bi,SM07-3-Bi)、白云母(SM07-1-Ms)、钾长石(DCS-1-Kf, SM07-3-Kf)和斜长石(YJ-Pl)以及基质(YJ-ma)进行精确年代学测试。花岗岩脉颗粒锆石U-Pb SHRIMP 加权平均年龄为30.8±0.3Ma(SM07-3, MSWD=3.27);其它单矿物激光40Ar/39Ar等时线年龄分别为13.1±1.5Ma (DCS-1-Kf, MSWD=2.9)、22.3±0.9Ma (SM07-1-Ms, MSWD=1.7)、21.9±0.7Ma (SM07-1-Bi, MSWD=1.3)、21.3±0.7Ma (SM07-3-Kf, MSWD=1.2)、22.7±0.8Ma (SM07-3-Bi, MSWD=2.4)、19.8±1.6Ma (YJ-ma, MSWD=19)和21.57±0.38Ma (YJ-Pl, MSWD=1.5)。结合区域地质背景、地质演化、野外观察和年代学资料,本文研究认为点苍山-哀牢山变质带的峰期变质变形时间为30Ma左右,此时山脉已开始隆升,在约20Ma和13Ma山脉分别经历一期构造热事件作用,揭示山脉经历快速隆升和冷却过程。Abstract: Ailao Shan-Diancang Mountain Ranges, which are situated in the central part of Yunnan Province, are distributed along the Red River-Ailao Shan strike-slip shear zone with northwest-southeast trending. The principal part of Ailao Shan-Diancang Mountain Ranges are composed of high metamorphic rock series (e.g. Cangshan Group and Ailao Shan Group), which are considered as the Precambrian metamorphic basement of the Yangtze Plate. The uplift time limit of Ailao Shan-Diancang Mountain Ranges and it’s metamorphic time limit, which due to lack of the accurate geochronological data constraints, have always been different views. In this paper we choose the granodioritic mylonite of Diancangshan Mountain (DCS-1),biotite granodioritic gneiss (SM07-1) and its synchronic deformational granite vein intrusion (SM07-3) of Ailaoshan Mountain’ Yuanjiang-Mojiang section and granitic gneiss (YJ) in the northwest of Yuanjiang city as research objects, and selected zircon particles (SM07-3)、biotite (SM07-1Bi, SM07-3Bi),muscovite (SM07-1Ms),potassium feldspar (DCS-1-kf, SM07-1-kf),plagioclase (YJ-Pl) and matrix (YJ-ma) to do the accurate chronology tests. The zircons from the granite vein yielded a concordant U-Pb SHRIMP ages of 30.8±0.3Ma (SM07-3, MSWD=3.27). The laser 40Ar/39Ar isochron ages of the other single minerals were 13.1±1.5Ma (DCS-1-Kf, MSWD=2.9), 22.3±0.9Ma (SM07-1-Ms, MSWD=1.7), 21.9±0.7Ma(SM07-1-Bi, MSWD=1.3), 21.3±0.7Ma(SM07-3-Kf, MSWD=1.2), 22.7±0.8Ma(SM07-3-Bi, MSWD=2.4),19.8±1.6Ma(YJ-ma, MSWD=19)and 21.57+0.38Ma(YJ-Pl, MSWD=1.5), respectively. With the regional geological background, geological evolution, field observations and geochronological data, this paper draws the conclusion that: The peak metamorphism deformation time of Ailao Shan-Diancang Shan metamorphic belt was about 30Ma, at this time the mountain ranges have began uplifting, and about 20Ma and 13Ma the mountains were underwent structural thermal events. It revealed that the mountains had experienced rapid uplifting and cooling process.
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