新疆阿尔泰山南缘玛音鄂博断裂南侧变质基性岩的发现及其地质意义

周刚; 张招崇; 杨文平; 谷高中; 张小林; 罗世宾; 王祥

新疆阿尔泰山南缘玛音鄂博断裂南侧变质基性岩的发现及其地质意义

周刚^{1, 2,},
张招崇³,
杨文平²,
谷高中²,
张小林²,
罗世宾²,
王祥²

1.
中国地质科学院研究生部, 北京 100037
2.
新疆地矿局第四地质大队, 新疆阿勒泰 836500
3.
中国地质大学地质过程与矿产资源国家重点实验室, 北京 100083

基金项目:

新疆维吾尔自治区1∶5万区调项目 XJQDW2003-03

国家“305”项目 2001BA609A-07-02

详细信息

作者简介:
周刚(1966-), 男, 高级工程师, 在职博士研究生, 主要研究方向为岩浆作用与成矿.E-mail: xazhougang@126.com

中图分类号: P588.3
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出版历程
- 收稿日期: 2005-07-02
- 刊出日期: 2005-11-25

Metabasic Rock on the South Side of Mayin'ebo Fault in the South Margin of Altay Mountains, Xinjiang, and Its Geological Implications

1.
Graduate School, Chinese Academy of Geological Sciences, Beijing 100037, China
2.
No.4 Geological Team of Xinjiang Bureau of Geology and Mineral Resources, Altay 836500, China
3.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China

摘要

摘要: 位于额尔齐斯-玛音鄂博大断裂带南侧的阿热勒托别变质基性岩产于下石炭统姜巴斯套组一套细碎屑沉积岩中.岩石组成以变质玄武岩为主, 它们具有相对高的TiO₂、MgO和低SiO₂、K₂O的特点; 在稀土元素组成上, 显示轻稀土弱富集的配分模式, 无明显Eu异常; 微量元素组成显示大离子亲石元素富集, 并具有明显的正Th异常和弱的Nb负异常、高的Nb含量(> 2×10^-6) 以及HFSE基本上和MORB相当的特点; 其Zr/Nb比值落在MORB范围之内, 而Ti/V比值略比MORB高, 表明其为MORB源的亏损地幔在相对较低熔融程度下熔融的产物.其ε_Nd(t) 值为+7.40~+8.35, 略低于MORB, 但高于洋岛以及大陆板内玄武岩.因此该变质基性岩总体上兼有火山弧和洋中脊玄武岩特征, 因而其可能形成于弧后环境, 代表了弧后盆地扩张早期的产物.
- 变质基性岩 /
- 地球化学 /
- 弧后盆地 /
- 额尔齐斯-玛音鄂博缝合带
Abstract: The Areletuobie metabasic rocks occur in the Lower Carboniferous Jiangbasitao Formation, which consists of sedimentary fine clastic sequences on the south side of the Ertix-Mayin'ebo deep-large fault that marks the boundary between the Altay and Junggar orogenic belts. The metabasic rocks display relatively high TiO₂ (1.15%-2.20%) and MgO contents (7.03%-9.54%), and relatively low SiO₂ (45.72%-48.31%) and K₂O contents (0.13%-0.41%). They exhibit slight LREE enrichment on the chondrite-normalized REE patterns without Eu anomalies. Their MORB-normalized trace element patterns are characterized by large ion lithophile element (LILE) enrichment with significantly positive Th anomalies, slightly negative Nb anomalies and high Nb concentrations (2.6×10^-6-8.7×10^-6), whereas their high field strength element (HFSE) contents resemble those of MORB. The Zr/Nb ratios range from 18.9 to 32.7, similar to those of MORB. In contrast, their Ti/V ratios are higher than those of MORB. All of these features suggest that they were generated by relatively low degrees of melting of MORB-like depleted mantle source. Their ε_Nd(t) values range from 7.40 to 8.35, lower than those of MORB, but higher than those rocks derived from oceanic island and intracontinental basalts. Consequently, the metabasic rocks have the somewhat transitional features of the volcanic rocks between a volcanic arc and an oceanic island. It is therefore inferred that they were formed from a back-arc basin, and represent the products in the early stage of back-arc basin spreading.
- metabasic rock /
- geochemistry /
- back-arc basin /
- Ertix-Mayin'ebo suture zone

HTML全文

图 1 阿热勒托别变质基性岩的位置及地质剖面

Fig. 1. Simplified geological map and section of the Areletuobie metabasic rocks

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图 2 阿热勒托别变质基性岩岩石的(Zr/TiO₂) ×10^-4-Nb/Y定名图(Winchester and Floyd, 1977)

+.阿热勒托别变质基性岩; ◆.卡拉麦里蛇绿岩带中玄武岩; △.阿尔曼太蛇绿岩带中玄武岩; □.库尔提蛇绿岩中玄武岩

Fig. 2. (Zr/TiO₂) ×10^-4 vs. Nb/Y diagram of the Areletuobie metabasic rocks

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图 3 阿热勒托别变质基性岩岩石的(FeO^*/MgO) -SiO₂图解(底图据Miyashiro, 1974)

Fig. 3. (FeO^*/MgO) -SiO₂ diagram of the Areletuobie metabasic rocks

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图 4 阿热勒托别变质基性岩稀土元素配分曲线(标准化数据据Sun and McDonough, 1989)

Fig. 4. Chondrite-normalized REE patterns of the Areletuobie metabasic rocks

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图 5 阿热勒托别变质基性岩微量元素MORB标准化曲线(标准化数据据Sun and McDonough, 1989)

Fig. 5. MORB-normalized trace element patterns of the Areletuobie metabasic rocks

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表 1 阿热勒托别变质基性岩的主元素(%)和微量元素(10^-6) 成分

Table 1. Major and trace element data of the Areletuobie metabasic rocks

表 2 阿热勒托别变质基性岩Sm-Nd同位素及模式年龄

Table 2. Sm-Nd isotopic compositions of the Areletuobie metabasic rocks and their modal ages

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