[1]杨高学,李永军,刘振伟.2012.西准噶尔玛依拉山组志留纪玄武岩的 地球化学特征及构造意义.大地构造与成矿学,36(1):127-136.
 YANG Gaoxue,LI Yongjun,LIU Zhenwei.2012.Geochemistry of the Basalts from the Silurian Maylashan Formation in the West Junggar and its Tectonic Implications.Geotectonica et Metallogenia,36(1):127-136.
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西准噶尔玛依拉山组志留纪玄武岩的 地球化学特征及构造意义
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《大地构造与成矿学》[ISSN:ISSN 1001-1552/CN:CN 44-1595/P]

卷:
期数:
2012年36卷01期
页码:
127-136
栏目:
岩石大地构造与地球化学
出版日期:
2012-02-06

文章信息/Info

Title:
Geochemistry of the Basalts from the Silurian Maylashan Formation in the West Junggar and its Tectonic Implications
作者:
杨高学1李永军1刘振伟1杨宝凯1张洪伟2佟丽莉1
1.长安大学 地球科学与资源学院,西部矿产资源与地质工程教育部重点实验室,陕西 西安 710054; 2.新疆维吾尔族自治区地质矿产勘查开发局 第七地质 大队,新疆 乌苏 833000
Author(s):
YANG Gaoxue1 LI Yongjun1 LIU Zhenwei1 YANG Baokai 1 ZHANG Hongwei2 and TONG Lili1
1.Earth Science & Resources College of Chang′an University; Key Laboratory of Western China′s Mineral Resources and Geological Engineering, Ministry of Education, Xi′an 710054, Shaanxi, China; 2.No.7 Geological Survey Team, Xinjiang Bureau of Geology and Mineral Resource Exploration, Wusu 833000, Xinjiang, China
关键词:
玄武岩弧后盆地玛依拉山组地球化学西准噶尔
Keywords:
basalt backarc basin Maylashan Formation geochemistry West Junggar
分类号:
P595
文献标志码:
A
摘要:
西准噶尔地区中-上志留统玛依拉山组主要分布于玛依拉山一带,以玛依勒蛇绿岩的围岩产出,两者为断层接触,主要组成为灰绿-暗灰绿色凝灰质粉- 细砂岩,砂岩和砂砾岩组合,夹硅质岩和玄武岩。对玄武岩进行详细的岩石地球化学研究表明,SiO2含量中等(47.1%~53.92%),高Fe2OT3(12.54%~17.82% )、Al2O3(13.3%~15.7%)、Na2O(3.84%~8.02%),低TiO2(0.45%~1.48%)、MgO(3.28%~5.77%,Mg#=27.01~41.96)、K2O(0.36%~0.7%),全碱 K2O+Na2O含量为4.4%~8.39%,属于亚碱性拉斑玄武岩系列。稀土元素总量较低(∑REE=27.16×10-6~54.41×10-6),轻、重稀土分馏较为明显((La/Yb) N=1.53~2.74),无明显Eu异常(Eu/Eu*=0.96~1.16),稀土配分模式类似于EMORB。相对富集LILE(如Rb、Ba、Th和K),亏损HFSE(如Zr、Ti),明显的 Nb和Ta负异常,具有岛弧玄武岩的地球化学特征。综合研究认为玛依拉山组玄武岩形成于俯冲带上的弧后盆地环境,与玛依拉山蛇绿岩的形成环境不同,其 岩浆来源于尖晶石二辉橄榄岩2%~10%的部分熔融,并有少量俯冲流体的参与。结合前人研究资料,认为西准噶尔在志留纪-石炭纪处在洋内弧演化阶段。
Abstract:
The Maylashan area is situated in the southern part of the West Junggar, NW China. The MiddleUpper Silurian Maylasha Formation consists of grayish green tuffaceous siltstone and finegrained sandstone, sandstone and conglomerate, with intercalated beds of chert and basalt, and fault contacts with the Maylashan ophiolitic mélange. The basalts are of subalkaline tholeiitic showing geochemical characteristics similar to those of island arc basalt (IAB), with low TiO2 (0.45%~1.48%), MgO (3.28%~5.77%, Mg#=27.01~41.96), K2O (0.36%~0.7%) and total alkaline (K2O+Na2O=4.4%~8.39%), medium SiO2 (47.1%~53.92%), high Fe2OT3(12.54%~17.82%), Al2O3 (13.3%~15.7%) and Na2O (3.84%~8.02%). The basalts are lower in REE (∑REE=27.16×10-6~54.41×10-6), and exhibit slightly flat REE patterns, with (La/Yb)N=1.53~2.74, weak or no Eu anomaly (Eu/Eu*=0.96~1.16), which are similar to those of EMORB. Moreover, the basalts are enriched in LILEs ( e.g. Rb, Ba, Th and K) and depleted in HFSEs (e.g. Ti and Zr) with pronounced negative NbTa anomalies. It can be deduced that the volcanic rocks were derived from partial melting of spinel iherzolite mantle source (2%~10% partial melting) with the participation of small amount of subducted fluid, under backarc basin setting different from that of the Maylashan ophiolitic mélange. Thus, an intraoceanic subduction model was proposed for the SilurianCarboniferous evolution of the West Junggar.

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备注/Memo

备注/Memo:
收稿日期: 2011-04-16; 改回日期: 2011-08-07 项目资助: 中央高校基本科研业务费专项资金(CHD2010ZY005)、国土资源大调查项目(XJZBKD200804,XJQDZ200903)联合资助。 第一作者简介: 杨高学(1980-),男,博士研究生,构造地质学专业。Email: mllygx@126.com
更新日期/Last Update: 2012-02-06