新疆富蕴县苏普特一带片麻岩地球化学特征及锆石U-Pb SHRIMP定年

雷永孝; 周刚; 秦纪华; 张立武; 虞卫东; 何立新

新疆富蕴县苏普特一带片麻岩地球化学特征及锆石U-Pb SHRIMP定年

1.
西安地质矿产研究所, 陕西西安 710054

2.
新疆维吾尔自治区地质矿产勘查开发局第四地质大队, 新疆阿勒泰 836500

3.
新疆宝地矿业公司, 新疆乌鲁木齐 830000

基金项目: 新疆富蕴县苏普特一带1:5万区域地质矿产调查(XJQD2003-01)

收稿日期: 2009-09-02

修回日期: 2009-12-18

刊出日期: 2010-03-15

Geochemistry and Zircon SHRIMP U-Pb Dating for Gneiss in Fuyun-Supute Belt of Xingjiang

1.
Xi'an Institute of Geology and Mineral Resources, Xi'an 710054, China

2.
No. 4 Geology Pary of Xinjing Bureau of Geology and Mineral Reources, Altay, 836500, China

3.
Baodi Mining Company, Urumqi 83000, China

Received Date: 02 September 2009

Revised Date: 18 December 2009

Publish Date: 15 March 2010

摘要

摘要: 苏普特片麻岩为含堇青石、矽线石及红柱石等变质矿物的眼球状、条纹条带状黑云斜长片麻岩、黑云二长片麻岩、二云母片麻岩等。其SiO₂含量为63.12%~68.34%,Al₂O₃为13.64%~15.91%,TiO₂为0.538%~0.772%,TFe₂O₃为6%左右,MgO含量较高,多数样品为3%左右。根据其岩石化学特征判断,原岩为泥质岩、砂岩等沉积岩。苏普特片麻岩稀土元素含量较高,ΣREE为155.21×10^-6~271.93×10^-6,轻稀土元素富集,具中等程度的负Eu异常;在以北美页岩(NASC)标准化的稀土配分型式图上具有较平缓的配分曲线,无明显的Ce、Eu异常。依据地球化学特征,推断其原岩的形成环境为活动大陆边缘。苏普特片麻岩中锆石具有岩浆锆石特征,其U-Pb SHRIMP年龄为282 Ma,可能代表了早二叠世的一次构造-岩浆-混合岩化事件。
- 苏普特片麻岩 /
- 地球化学 /
- 锆石U-Pb SH RIMP定年
Abstract: The Supute gneiss complex is composed of andalusite,sillimanite,and cord ierite.It contains SiO₂ ranging from 63.1% to 68.3%,Al₂O₃ from 13.64% to 15.91%,TiO₂ from 0.53% to 0.77%,and relatively high MgO(mostly～3%).In line with their geochemical composition,they are metamorphized products of greywackes.For the trace elements,their total REE ranges from 155ppm to 272ppm and the LREE are enriched relative to the HREE with middle Eu negative anomalies.NASC normalized REE patterns of the Supute gneiss are coherently flat with insignificant Ce and Eu anomalies.Their geochemistry suggests that they are formed a long an active continental margin.Zircons from Supute gneiss show typical characteristics crystallized from magma and a SHR MIPU-Pb age of 282 Ma.Thus,the Supute gneiss represents an early Permian tectonomagmatic event.
- Supute gneiss /
- geochemistry /
- zircon SHR MIPU-Pb age

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新疆富蕴县苏普特一带片麻岩地球化学特征及锆石U-Pb SHRIMP定年

1. 西安地质矿产研究所, 陕西 西安 710054 2. 新疆维吾尔自治区地质矿产勘查开发局第四地质大队, 新疆 阿勒泰 836500 3. 新疆宝地矿业公司, 新疆 乌鲁木齐 830000

Geochemistry and Zircon SHRIMP U-Pb Dating for Gneiss in Fuyun-Supute Belt of Xingjiang

1. Xi'an Institute of Geology and Mineral Resources, Xi'an 710054, China 2. No. 4 Geology Pary of Xinjing Bureau of Geology and Mineral Reources, Altay, 836500, China 3. Baodi Mining Company, Urumqi 83000, China

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1.
西安地质矿产研究所, 陕西西安 710054

2.
新疆维吾尔自治区地质矿产勘查开发局第四地质大队, 新疆阿勒泰 836500

3.
新疆宝地矿业公司, 新疆乌鲁木齐 830000

1.
Xi'an Institute of Geology and Mineral Resources, Xi'an 710054, China

2.
No. 4 Geology Pary of Xinjing Bureau of Geology and Mineral Reources, Altay, 836500, China

3.
Baodi Mining Company, Urumqi 83000, China