CAJ | 학술논문

对西藏冈底斯西部措勤县打加错地区辉石角闪二长闪长岩进行了 LA-ICP-MS 锆石 U-Pb 法定年及岩石地球化学研究，结果表明：辉石角闪二长闪长岩的结晶年龄为207.3±3.6Ma，其物质来源与下地壳基性熔岩及上地幔的部分熔融有关，是特提斯洋在晚印支期仍在俯冲的证据。该印支晚期侵入岩系首次在南冈底斯带西侧发现，对研究冈底斯带在晚印支期的构造岩浆演化具有重要意义。
대서장강저사서부조근현타가착지구휘석각섬이장섬장암진행료 LA-ICP-MS 고석 U-Pb 법정년급암석지구화학연구，결과표명：휘석각섬이장섬장암적결정년령위207.3±3.6Ma，기물질래원여하지각기성용암급상지만적부분용융유관，시특제사양재만인지기잉재부충적증거。해인지만기침입암계수차재남강저사대서측발현，대연구강저사대재만인지기적구조암장연화구유중요의의。
The determinations of LA-ICP-MS zircon U-Pb dating,isotopic compositions and major elements give a magmatic crystallization age of 207. 3 ± 3. 6 Ma for the pyroxene amphibole monzodiorite from the Daggyai Lake area,Coqen,western Gangdise,Xizang. The origin of matter may be related with the lower crustal basic lava and partial melting of the upper mantle. The late Indosinian intrusive rocks discovered for the first time in western Gangdise were formed in the orogenic tectonic setting,and attested to the continuous subduction of the Tethyan Ocean during the late Indosinian. The findings in this study will provide useful approaches to the tectonic evolution of the Gangdise region during the late Indosinian.