伊拉克东北部Sidakan地区辉绿岩脉的K-Ar定年、岩石学和地球化学:对岩石成因和新特提斯构造的启示

IF 1.7 Q3 GEOSCIENCES, MULTIDISCIPLINARY Journal of Asian Earth Sciences: X Pub Date : 2023-01-01 DOI:10.1016/j.jaesx.2023.100142
Yawooz A. Kettanah , Alan Koyi , Nihad M. Karo
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摘要

本文介绍了伊拉克东北部Sidakan地区辉绿岩岩脉的岩石学、地球化学、矿物化学和地质年代。该区域由玄武岩和辉绿岩岩脉与沉积岩交替组成,由作为Zagros褶皱冲断带(ZFTZ)一部分的Walash变火山岩群(WMG)托管。这些岩石颜色为深灰色至浅棕色,粒度为细至中等,具有斑岩和斑状结构。它们由作为主要矿物的斜长石和单斜辉石以及次要橄榄石及其蚀变和低级变质产物组成,包括角闪石、钠长石、绿帘石、绿泥石、蛇纹石、方解石和绢云母,钛铁矿为副矿物。辉绿岩脉由51.41 SiO2、15.82 Al2O3、9.95 FeOt、6.58 MgO、9.63 CaO、3.42 Na2O、0.87 TiO2、0.17 MnO、0.35 K2O、0.09 P2O5和1.92 LOI组成(平均重量%)。哈克图表明,辉绿岩是由拉斑玄武岩母岩浆的分离结晶形成的。Nb/Y与Zr/TiO2的分类图表明,所研究的辉绿岩具有亚碱性玄武岩的亲和力,而SiO2与K2O的分类图则表明它们分为低K玄武岩和玄武岩安山岩。构造判别图表明,辉绿岩为具有N-MORB地球化学亲和力的洋岛弧拉斑玄武岩。辉绿岩的K−Ar年龄为始新世晚期(Bartonian-Priabonian),范围为34.6±0.84至39.2±1.81Ma,代表其侵入/结晶年龄,可能是大洋岛弧形成的年龄和/或阿拉伯-伊朗微板块之间的初始碰撞阶段。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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K-Ar dating, petrography, and geochemistry of diabase dikes from Sidakan area, northeastern Iraq: Implications for petrogenesis and Neotethyan tectonics
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来源期刊
Journal of Asian Earth Sciences: X
Journal of Asian Earth Sciences: X Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
3.40
自引率
0.00%
发文量
53
审稿时长
28 weeks
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