Truong Son带北部古近系花岗岩岩浆作用及其对地壳演化的意义

IF 2.4 Q2 GEOSCIENCES, MULTIDISCIPLINARY

VIETNAM JOURNAL OF EARTH SCIENCES Pub Date : 2021-08-19 DOI:10.15625/2615-9783/16444

Huan Trinh Dinh, Tri Luu Cong, A. Tuan, Anh Tran Viet, Giang Phan Hoang, Takahashi, Saadsy

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引用次数: 4

摘要

长顺带北部的Phu Hoat高变质带暴露了大量年龄为24.59 ~ 28.62 Ma的花岗岩类，分别为老挝北部的Na Khoun杂岩(NL)和越南西部的Ban Chieng杂岩(WV)。从这些杂岩体中采集的10个花岗岩样品显示出高SiO2和K2O含量、中等过铝质的地球化学特征，属于s型花岗岩。87Sr/86Sr初始同位素比值和εNd(t)分别为0.708507 ~ 0.74539和-5.22 ~ -12.66，且206Pb/204Pb(18.864 ~ 19.392)、207Pb/204Pb(15.736 ~ 15.841)和208Pb/204Pb(39.223 ~ 40.080)较高，显示出地壳成因，认为NL-WV侵入与新生代印度-亚洲碰撞事件的逆压形成有关。

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Paleogene granite magmatism in the north of the Truong Son belt and implication for crustal evolution

Abundant granitoids aged 24.59 Ma to 28.62 Ma were exposed along Phu Hoat high metamorphic zone, northern of the Truong Son belt, termed Na Khoun complex in Northern Laos (NL) and Ban Chieng complex in Western Vietnam (WV). Ten granitic samples were collected from these complexes show geochemical characteristics of high SiO2 and K2O contents, medium peraluminous that belong to S-type granites. Initial 87Sr/86Sr isotopic ratios and εNd(t) are broad values of 0.708507 to 0.74539 and -5.22 to -12.66, respectively, together with high 206Pb/204Pb (18.864-19.392), 207Pb/204Pb (15.736-15.841) and 208Pb/204Pb (39.224-40.080) which indicated crustal origin, we suggest that the NL-WV intrusion was associated with transpression form by the India-Asia collision events during Cenozoic.

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来源期刊

VIETNAM JOURNAL OF EARTH SCIENCES GEOSCIENCES, MULTIDISCIPLINARY-

CiteScore

3.60

自引率

20.00%

发文量