U-Pb dating for zircons from granitic rocks in southwestern Cambodia

被引：0

作者：

Uchida, Etsuo ^{[1
]}

Nagano, Shinya ^{[1
]}

Niki, Sota ^{[2
]}

Yonezu, Ko ^{[1
]}

Yokokura, Takumi ^{[1
]}

Cheng, Rathborith ^{[3
]}

Hirata, Takafumi ^{[2
]}

机构：

[1] Waseda Univ, Sch Creat Sci & Engn, Dept Resources & Environm Engn, Ohkubo 3-4-1, Tokyo, Tokyo 1698555, Japan

[2] Univ Tokyo, Geochem Res Ctr, Grad Sch Sci, Hongo 7-3-1, Bunkyo, Tokyo 1130064, Japan

[3] Minist Mines & Energy, Dept Geol, 79-80,St 51,Sankat Phsar Thmey 3, Phnom Penh 12210, Cambodia

来源：

HELIYON | 2023年 / 9卷 / 09期

基金：

日本学术振兴会;

关键词：

U-Pb dating; Zircon; Granite; Indosinian Orogeny; Mae Ping Fault; Southwestern Cambodia; NW THAILAND; CONSTRAINTS; URANIUM; ZONE;

D O I：

10.1016/j.heliyon.2023.e19734

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

U-Pb dating was conducted for zircons from a total of 14 samples from 13 granite bodies in southwestern Cambodia using LA-ICP-MS. The granitic rock samples were collected from southwestern Cambodia, southwest of the Mae Ping Fault extending from northwest Cambodia via Tonle Sap Lake to southern Vietnam. The studied rock bodies belong to the ilmenite-series, except for three granitic rock bodies. They were identified as I-or A-type. The analysis yielded three distinct age ranges: 295-309, 191-232, and 75-98 Ma. The 295-309 Ma ages are associated with the Paleo-Tethys Sea subduction beneath the Indochina Block. The ages of 191-232 Ma may correspond to the amalgamation period of the Sibumasu and Indochina Blocks during the Indosinian Orogeny. Granitic rocks with ages of 75-98 Ma occur near the southeastern Cambodiasouthern Vietnam border. Formation of these granitic rocks was associated with the PaleoPacific Ocean Plate (the Izanagi Plate) subduction beneath the Indochina Block. The region in which these granitic rocks occur is part of the Dalat-Kratie Zone.

引用

页数：12

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