Zircon U-Pb dating and geochemistry of the Late Carboniferous hornblendite in Dong Ujimqi Inner Mongolia and its tectonic significance

被引：0

作者：

Zhang X. ^{[1
,2
]}

Cheng Y. ^{[2
]}

Li Y. ^{[1
]}

Xu X. ^{[1
]}

Teng X. ^{[2
]}

Wang S. ^{[2
]}

Li Y. ^{[1
]}

Liu H. ^{[3
]}

机构：

[1] College of Earth Sciences, Hebei GEO University, Shijiazhuang

[2] Tianjin Geological Survey Center of China Geological Survey, Tianjin

[3] School of the Earth Sciences and Resources, China University of Geosciences, Beijing

来源：

Dizhi Xuebao/Acta Geologica Sinica | 2021年 / 95卷 / 05期

关键词：

Hf isotope; Hornblendite; Late Carboniferous; Xing'anling-Mongolian orogenic belt; Zircon U-Pb dating;

D O I：

10.19762/j.cnki.dizhixuebao.2021074

中图分类号：

学科分类号：

摘要：

This study undertookelectron microprobe, zirconU-Pb dating and petrographic, geochemical analyses onthehornblendite firstly recognized in the Bayandulan of Dong Ujimqi to understand the characteristics of the late Paleozoic mantle nature and structure. In these rocks, mainrockformingminerals are hornblende, someplagioclase and magnetite.The dating results indicate that the hornblendite formed in the Late Carboniferous 310±1 Ma. The geochemical data of the samples show SiO2 (48.66%~52.50%), MgO (11.53%~13.10%), Al2O3 (10.11%~12.18%), Na2O+K2O (2.21%~3.13%, < 3.5%, m/f (0.36~0.45), Mg#(70.27~74.54), TFeO(7.77%~10.14%). The standardized distribution pattern of REE chondrites is right-leaning with relatively enriched LREE.The rocks are enriched in LILE (Rb, K), and depleted in HFSE (Nb, Ta, Ti), and there are obvious negative anomalies of Nb, Ta and Ti. Electron probe analyses results show that hornblende belongs to calcic amphibole and has the characteristics of mantle hornblende. The εHf(t) values of zircons from the hornblendite vary between 7.47~15.54, and their Hf one-stage model ages vary from 847 to 332 Ma, implying that their magma source was derived from a depleted mantle.Combined with regional tectonic evolution, the hornblendite formed in the subduction setting of the Paleo-Asian Ocean.This discovery provides rock evidence for the late Paleozoic mantle tectonomagmatic evolution. © 2021, Science Press. All right reserved.

引用

页码：1495 / 1507

页数：12

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