|本期目录/Table of Contents|

[1]李永军,陶晓杨,王祚鹏,等.东准噶尔青河地区野马滩一带托让格库都克组高铝玄武岩的发现及其地质意义[J].地球科学与环境学报,2019,41(01):1-14.
 LI Yong-jun,TAO Xiao-yang,WANG Zuo-peng,et al.Discovery of High-alumina Basalt of Tuoranggekuduke Formation in Yematan of Qinghe Area, East Junggar, China and Its Geological Significance[J].Journal of Earth Sciences and Environment,2019,41(01):1-14.
点击复制

东准噶尔青河地区野马滩一带托让格库都克组高铝玄武岩的发现及其地质意义(PDF)
分享到:

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

卷:
第41卷
期数:
2019年第01期
页码:
1-14
栏目:
基础地质与矿产地质
出版日期:
2019-01-15

文章信息/Info

Title:
Discovery of High-alumina Basalt of Tuoranggekuduke Formation in Yematan of Qinghe Area, East Junggar, China and Its Geological Significance
文章编号:
1672-6561(2019)01-0001-14
作者:
李永军陶晓杨王祚鹏徐倩
1.长安大学 地球科学与资源学院,陕西 西安 710054;2.国土资源部岩浆作用成矿与找矿重点实验室,陕西 西安 710054
Author(s):
LI Yong-jun TAO Xiao-yang WANG Zuo-peng XU Qian
1. School of Earth Science and Resources, Chang’an University, Xi’an 710054, Shaanxi, China;2. Key Laboratory for the Study of Focused Magmatism and Giant Ore Deposits of Ministry of Land and Resources, Xi’an 710054, Shaanxi, China
关键词:
高铝玄武岩地幔楔滞后结晶岛弧早泥盆世托让格库都克组东准噶尔
Keywords:
high-alumina basalt mantle wedge delayed crystallization island arc Early Devonian Tuoranggekuduke Formation East Junggar
分类号:
P588.14;P597;P581
DOI:
-
文献标志码:
A
摘要:
下泥盆统托让格库都克组高铝玄武岩产自东准噶尔青河地区野马滩一带。高铝玄武岩富含大量斜长石斑晶,属亚碱性系列。它们具有显著高A12O3(质量分数为17.22%~21.31%),低SiO2(47.12%~49.45%),高TFe2O3(8.50%~11.98%)、MgO(2.64%~5.63%)、Ni((5.75~27.87)×10-6)、Cr((0.99~25.62)×10-6),以及高Sm/Yb值(1.13~1.96)、U/Th值(0.42~0.81)的特征,相对富集大离子亲石元素和亏损高场强元素,显示出典型的高铝玄武岩地球化学特征。进一步研究表明,其岩浆来源于受俯冲带流体交代地幔楔的部分熔融。此外,高Sr/Y值(43.16~47.07)和低Y(质量分数为(15.69~19.09)×10-6)、Yb((1.64~2.13)×10-6)显示玄武质岩浆源区有俯冲带洋壳物质的加入。高Al特征很可能与高压条件下斜长石的滞后结晶有关。地球化学特征表明,高铝玄武岩形成于岛弧环境。东准噶尔早泥盆世高铝玄武岩的发现丰富了本区火山岩岩类信息资料,并为构造演化研究提供了重要依据。
Abstract:
The high-alumina basalts of Lower Devonian Tuoranggekuduke Formation occur in Yematan of Qinghe area, East Junggar, China. The high-alumina basalts are rich in a large number of plagioclase phenocrysts, belonging to a sub-alkaline series. The basalts have significantly high A12O3 (the mass fraction is 17.22%-21.31%), low SiO2 (47.12%-49.45%), and high TFe2O3 (8.50%-11.98%), MgO (2.64%-5.63%), Ni ((5.75-27.87)×10-6), Cr ((0.99-25.62)×10-6), and high Sm/Yb ratio (1.13-1.96), U/Th ratio (0.42-0.81), and they relatively enrich in large ion lithophile elements and deplete in high field strength elements, indicating the characteristics of the typical geochemical features of high-alumina basalts. The further research shows that the magma is derived from the partial melting of the mantle wedge modified by the subduction zone fluid. In addition, the basalts with high Sr/Y ratio (43.16-47.07), low Y (the mass fraction is (15.69-19.09)×10-6) and Yb ((1.64-2.13)×10-6) indicate that the source of basaltic magma may contain subduction zone oceanic crust materials. The characteristics of high Al are likely to be related to the delayed crystallization of plagioclase under high pressure conditions. Geochemical characteristics indicate that these high-alumina basalts are formed in an island arc environment. The discovery of Early Devonian high-alumina basalts enriches the petrographic data of volcanic rocks in East Junggar and provides an important basis for the study of tectonic evolution.

参考文献/References:

-

相似文献/References:

备注/Memo

备注/Memo:
收稿日期:2018-10-17;修回日期:2018-11-27
基金项目:国家自然科学基金项目(41273033);新疆维吾尔自治区地质勘查基金项目(Y15-1-LQ01)
作者简介:李永军(1961-),男,甘肃天水人,长安大学教授,博士研究生导师,理学博士,E-mail:yongjunl@chd.edu.cn。
更新日期/Last Update: 2019-01-25