云开造山带强过铝深熔花岗岩地球化学、年代学及构造背景

彭松柏; 金振民; 刘云华; 付建明; 何龙清; 蔡明海; 王彦斌

云开造山带强过铝深熔花岗岩地球化学、年代学及构造背景

1.
中国地质大学地球科学学院，湖北武汉 430074
2.
宜昌地质矿产研究所, 湖北宜昌 443003
3.
中国地质科学院地质研究所北京离子探针中心, 北京 100037

基金项目:

国家自然科学基金项目 40072069

中国地质调查局项目 200313000041

详细信息

作者简介:
彭松柏(1963-), 男, 研究员, 主要研究方向为造山带花岗岩地质及区域成矿预测.E-mail:psb200301@yahoo.com.cn

中图分类号: P588.12;P597
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出版历程
- 收稿日期: 2005-07-15
- 刊出日期: 2006-01-25

Petrochemistry, Chronology and Tectonic Setting of Strong Peraluminous Anatectic Oanitoids in Yunkai Orogenic Belt, Western Guangdong Province, China

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Yichang Institute of Greology and Mineral Resources, Yichang 443003, China
3.
Beijing SHRIMP Center, Institute of Geology. CAGS, Beijing 100037, Chrina

摘要

摘要: 云开造山带条带—眼球状(环斑)深熔花岗岩(含紫苏花岗岩)地球化学和年代学的研究表明, 绝大多数花岗岩的A/CNK > 1.1, CaO/Na₂O=0.62-1.61(平均0.94, 大于0.3), Al₂O₃/TiO=16.6-60.6(平均23.68), 高场强元素Ta、Nb、Zr亏损, 具大陆边缘俯冲-碰撞造山带后碰撞构造环境强过铝(SP)高钾钙碱性-钙碱性花岗岩的特征, 紫苏花岗岩和片麻状含榴黑云二长花岗岩Al₂O₃/TiO(平均17.82)明显低于条带-眼球状(环斑)黑云二长花岗岩Al₂O₃/TiO(平均29.55), 显示其形成温度更高, 并具A型花岗岩的演化特征.而且从高钾钙碱性条带-眼球状(环斑)黑云二长花岗岩到钙碱性紫苏花岗岩、片麻状含榴黑云二长花岗岩, 形成时代由(465±10)Ma、(467±10)Ma变为(435±11)Ma、(413±8)Ma, 表明扬子板块与华夏板块在加里东期发生了洋—陆俯冲—碰撞造山和后碰撞的伸展—拆沉—底侵岩浆岩作用, 并且后期又经历了海西—印支期挤压抬升和伸展揭顶作用的改造, 这也为华南存在加里东期扬子板块向华夏板块的洋-陆俯冲-碰撞造山提供了重要证据.
- 云开造山带 /
- 加里东期 /
- 强过铝深熔花岗岩 /
- 后碰撞构造环境 /
- 伸展-拆沉-底侵作用
Abstract: There are different theories about the genesis and age of banded-augen (rapakivi) anatectic granitoids (charnock-ite), which outcrop extensively in Yunkai region, western Guangdong Province. Their petrochemistry, chronology, defor-mational and metamorphic structures were studied. The petrochemical features of most granitoids are: A/CNK > 1. 1, Cao/Na₂O=0. 62 - 1. 61 (average 0. 94, > 0.3), Al₂O₃/TiO=16.6-60.6 (average 23. 68), loss high field strong elements Ta、Nb、Zr, strong peraluminous high-K calc-alkaline and calc-alkaline granitoids in a post-collisional tectonic enviroment of sub-duction-collision orogenic belt in an active-continental margin. The temperatures of charnockite and gneissic garnet-bearing biotite monzonitic granite are obviously higher than that of banded-augen (rapakivi) biotite monzonitic granite, and charnockite and gneissic garnet-bearing biotite monzonitic granite with the evolutional characterics of A-type granites. From banded-granite, augen (rapakivi) biotite monzonitic granite to charnockite and gneissic garnet-bearing biotite monzonitic granite, the forming ages are (465±10)Ma, (467±10)Ma, (435±11)Ma and (413±8)Ma respectively, and become younger. These results show that there were oceanic-continental subduction-collision and post-collisional extension-delamination-underplating between the Yangtze and Cathaysia plates during the Caledonian, and they experienced compressional uplift and extensional exhumation during the Indosinian. It provides important evidence of the oceanic-continental subduction-collision of the Yangtze plate downward to the Cathaysia plate during the Caledonian in South China.
- Yunkai orogenic belt /
- Caledonian /
- strong peraluminous anatectic granitoids /
- post-collisional tectonic enviro-ment /
- extension-delamination-underplating.

HTML全文

图 1 云开地区地质构造略图

1.新生界(Kz); 2.中生界(Mz); 3.古生界(Pz); 4.云开群(Pt₃);5.高州表壳岩系(Pt_1~2);6.燕山期花岗岩(γ₅);7.海西—印支期花岗岩(γ₄);8.加里东期花岗岩(γ₃);9.地块边界断裂; 10.韧性剪切带; 11.变基性超基性岩; 12.采样位置; 13.测年样位置

Fig. 1. Geological sketch map of Yunkai area

下载: 全尺寸图片幻灯片

图 2 花岗岩K₂O-SO₂判别图解(Le Maitre et al., 1989; Rickwood, 1989)

○.紫苏花岗岩; □.眼球状黑云二长花岗岩; △.环斑黑云二长花岗岩; ◇.片麻状含榴黑云二长花岗岩

Fig. 2. K₂O vs.SiO₂ discriminant diagrams for the granitoids

下载: 全尺寸图片幻灯片

图 3 花岗岩Rb-(Y+Nb)判别图解和Rb-(Yb+Ta)判别图解(Pearce et al., 1984)

VAG.火山弧花岗岩; Syn-COLG.同碰撞花岗岩; WPG.板内花岗岩; ORG.洋脊花岗岩; 其余图例同图 2

Fig. 3. Rb-(Y+Nb) and Rb-(Yb+Ta) tectonic discriminant diagrams for the granitoids

下载: 全尺寸图片幻灯片

图 4 花岗岩Hf-Rb-Ta判别图解(Harris et al., 1986; 图例同图 2)

Fig. 4. Hf-Rb-Ta tectonic discriminant diagrams for the granitoids

下载: 全尺寸图片幻灯片

图 5 云开地区花岗岩锆石的SHRIMP U-Pb年龄谐和图

Fig. 5. Zircon SHRIMP U-Pb concordia diagram of the granitoids from the Yunkai area

下载: 全尺寸图片幻灯片

表 1 云开地区花岗岩主量和微量元素地球化学分析数据

Table 1. Major (%) and trace(μg·g^-1) element analyses of the granitoids from the Yunkai area

表 2 云开地区花岗岩锆石SHRIMP U-Pb同位素分析数据

Table 2. SHRIMP U-Pb data of zircons of the granitoids from the Yunkai area

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