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苏门答腊岛位于印度尼西亚西缘,大地构造位置处于印度-澳大利亚板块向欧亚板块俯冲的前缘地区,实武牙复式花岗岩体是该岛规模较大的花岗岩体,至今仍缺少高精度年代学研究,制约了对其岩石成因和区域构造演化的深入认识。本文对Sarudik地区实武牙岩体黑云母二长花岗岩进行了LAICP-MS锆石U-Pb年龄测定,获得其年龄值为225.3±0.8Ma,表明成岩时代为晚三叠世。前人岩石地球化学研究指示其为A1型花岗岩,结合苏门答腊岛区域地质研究结果,晚三叠世实武牙地区总体处于陆内伸展环境,实武牙复式岩体Sarudik地区黑云母二长花岗岩是中-晚三叠世苏门答腊岛局部地壳伸展减薄、岩浆上侵的产物。
Sumatra is located on the western margin of Indonesia. The tectonic location of the Sumatra is located in the leading edge of the subduction of the Indo-Australian Plate to the Eurasian Plate. The solid-to-wadi duplex granite is the larger granite body of the island and still lacks high-precision geochronology. Which restricted the deep understanding of its rock genesis and regional tectonic evolution. In this paper, LAICP-MS zircon U-Pb zircon dating of the biotite monzogranite from the Sertigianite in the Sarudik area has been studied. Its age value is 225.3 ± 0.8Ma, indicating that the diagenetic age was Late Triassic. The predecessors’ studies on petrochemistry indicate that they are A1-type granites. Based on the results of the Sumatra regional geological study, the Late Triassic Shiwuya region is generally in an inland extension environment. The biotite monzogranite in the Sarudik area, Middle - Late Triassic Sumatra Island local crustal extension thinning, magma intrusion products.