New Research Results on Geochemistry and Zircon U–Pb Geochronology of Ankroet Granite in Dalat Zone and Geological Significance

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Doklady Earth Sciences Pub Date : 2024-09-04 DOI:10.1134/s1028334x24602591

Tran Van Xuan, Pham Minh, Pham Trung Hieu, Nguyen Tuan

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Abstract

Ankroet granite from the Dalat zone (DZ), Vietnam, is commonly the main petrographic composition of granite and biotite granite, coinciding with the Ankroet complex. The primary rock-forming minerals of the Ankroet granite include plagioclase (30–35%), quartz (30–35%), K-feldspar (25–30%), and biotite (5–7%). Geochemically, they are metaluminous with an average A/CNK value of 0.95–1.04, high SiO₂ (73.68–74.14), and low Na₂O/K₂O < 1. Petrographical and geochemical characteristics of Ankroet granites are classified as A-type granite generated from post-orogenic magmas. Zircons selected from these rocks are characterized by prismatic shape, oscillatory zoning, no luminescent rim, and a high ratio Th/U (0.75–1.78) that are indications of the magmatic origin. We report the first LA-ICP-MS ²⁰⁶Pb/²³⁸U zircon ages of 87.9 Ma for the Ankroet granite in the DZ in southern Vietnam. This age value is temporally consistent with Late Cretaceous magmatism previously reported in the DZ. Together with other Late Mesozoic magmatic complexes along the DZ, the Ankroet granites are a representative of magmatism linked to post-orogenic magmas beneath the Indochina block during the Late Cretaceous.

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达拉特区安克罗特花岗岩地球化学和锆石 U-Pb 地质年代新研究成果及其地质意义

摘要越南达叻区（DZ）的安克罗特花岗岩通常是花岗岩和生物花岗岩的主要岩相组成，与安克罗特复合体相吻合。Ankroet 花岗岩的主要成岩矿物包括斜长石（30-35%）、石英（30-35%）、K 长石（25-30%）和斜长石（5-7%）。安克罗伊特花岗岩的岩石学和地球化学特征被归类为由后成因岩浆生成的 A 型花岗岩。从这些岩石中选取的锆石具有棱柱状、振荡带状、无发光边缘和高 Th/U 比值（0.75-1.78）等特征，这些都是岩浆起源的标志。我们首次报告了越南南部 DZ 地区 Ankroet 花岗岩的 LA-ICP-MS 206Pb/238U 锆石年龄（87.9 Ma）。这一年龄值在时间上与之前报告的DZ地区晚白垩世岩浆活动一致。Ankroet花岗岩与DZ沿线的其他晚中生代岩浆复合体一起，是晚白垩世印度支那岩块下与后成因岩浆有关的岩浆活动的代表。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.