北阿尔金恰什坎萨依沟地区早古生代构造变形特征及构造演化启示

吴玉; 陈正乐; 陈柏林; 王永; 孟令通; 孙岳; 何江涛; 王斌; 张文高

doi:10.12090/j.issn.1006-6616.2019.25.03.028

北阿尔金恰什坎萨依沟地区早古生代构造变形特征及构造演化启示

doi: 10.12090/j.issn.1006-6616.2019.25.03.028

吴玉^{1, 2, 3,},
陈正乐^{2, 3, 4},
陈柏林^{2, 3},
王永^{2, 3},
孟令通⁵,
孙岳⁴,
何江涛⁶,
王斌^{2, 3},
张文高^{2, 3}

1.
核工业北京地质研究院地质矿产研究所, 北京 100029
2.
中国地质科学院地质力学研究所, 北京 100081
3.
中国地质科学院地质力学研究所动力成岩成矿实验室, 北京 100081
4.
东华理工大学, 江西南昌 330013
5.
中国科学院地质与地球物理研究所, 北京 100029
6.
中国地质调查局天津地质调查中心, 天津 300170

基金项目:

国家自然科学基金 41802218

"十二五"国家科技支撑计划项目 2011BAB06B08-04

中国核工业地质局铀矿地质科研项目地D1902

详细信息

作者简介:
吴玉(1987-), 男, 博士, 工程师, 从事区域构造与岩石大地构造研究。E-mail:21wu.yu@163.com

中图分类号: P542;P534.4
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- 被引次数: 0
出版历程
- 收稿日期: 2018-12-26
- 修回日期: 2019-04-10
- 刊出日期: 2019-06-01

EARLY PALEOZOIC TECTONIC DEFORMATION IN QIASHENKANSAYIGOU AREA, NORTH ALTUN, AND IMPLICATION FOR TECTONIC EVOLUTION

WU Yu^{1, 2, 3
,},
CHEN Zhengle^{2, 3, 4},
CHEN Bailin^{2, 3},
WANG Yong^{2, 3},
MENG Lingtong⁵,
SUN Yue⁴,
HE Jiangtao⁶,
WANG Bin^{2, 3},
ZHANG Wengao^{2, 3}

1.
Beijing Research Institute of Uranium Geology, CNNC, Beijing 100029, China
2.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
3.
The Laboratory of Dynamic Digenesis and Metallogenesis, Institute of Geomechanics, CAGS, Beijing 100081, China
4.
East China Institute of Technology, Nanchang 330013, Jiangxi, China
5.
Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
6.
Tianjin Center, China Geological Survey, Tianjin 300170, China

摘要

摘要: 出露在青藏高原北缘的红柳沟-拉配泉蛇绿混杂岩带一直以来为深入研究北阿尔金早古生代构造格架及演化提供了宝贵信息。经详细的野外地质填图和构造解析，文章针对红柳沟-拉配泉蛇绿混杂岩带内的构造样式、变形特征及形成时限进行研究，将北阿尔金蛇绿混杂岩带进一步细分为北侧混杂单元、中间层序单元和南侧混杂单元三个次级构造单元，南、北两侧混杂单元内以发育一系列复杂褶皱和逆冲断层为典型构造特征。卷入褶皱变形的最年轻地层岩石为中-晚奥陶世硅质岩，并被（416.8±3.7）Ma未变形的正长斑岩脉所截切；卷入逆冲断层的混杂岩中辉长岩和斜长花岗岩年龄为479~521 Ma和512.1~518.5 Ma，随后也被410.7~418.5 Ma未变形的冰沟岩体所侵位。这些基本事实表明，褶皱构造与逆冲断层均形成于中奥陶世-早泥盆世，推测其成因与北阿尔金洋俯冲作用导致的洋壳强烈缩短变形有关。在南侧混杂单元，褶皱构造样式自北向南逐渐由直立褶皱转变为斜歪褶皱，最后转变为倒转褶皱，显示出递进变形特征。褶皱所对应的应变椭球体也发生了旋转，表现出顶端指向北北东向的剪切作用，与混杂单元内逆冲断层所具有的向北北东方向逆冲、推覆特征相一致，从而推测它们与北阿尔金洋南南西向俯冲消减有密切联系。另外，在北侧混杂单元内还发育有同时期向南南东方向逆冲的断层以及轴面倾向北北东的斜歪褶皱，暗示北阿尔金洋在早古生代可能还发育有北北东方向的俯冲极性，整个北阿尔金洋俯冲消减模式可能具有双向性。
- 混杂岩 /
- 褶皱 /
- 逆冲断层 /
- 构造演化 /
- 早古生代 /
- 北阿尔金
Abstract: Hongliugou-Lapeiquan ophiolitic mélange belt, which is exposed in the northern margin of the Qinghai-Tibet Plateau, has been providing significant information for the deep study of Early Paleozoic tectonic framework and evolution of North Altun. On the basis of detailed geological mapping and structural analysis, ophiolitic mélange belt was divided into the following three sub-tectonic units from north to south:the north incoherent unit, the middle coherent unit and the south incoherent unit. There mainly develop a series of complex folds and thrust faults in the north and south incoherent units. The youngest stratum involved in the folds is formerly defined Middle-Late Ordovician silicalite. SHRIMP zircon U-Pb dating from a Syenite porphyry dyke, truncating the above folds, yielded a weighted mean age of 416.8±3.7 Ma. The gabbro and plagiogranite in the mélange are involved in the thrust fault and have U-Pb age of ca. 479~521 Ma and ca. 512.1~518.5 Ma, respectively. Meanwhile, one undeformed Bingou pluton intruding the thrust fault was dated at ca. 410.7~418.5 Ma. All of these results support that the age of the folds and thrust faults in the incoherent units are tightly constrained at the Middle Ordovician to early Devonian, implying that the deformation in the ophiolitic mélange are related to an intense compression during the subduction of the North Altyn ocean. In the south incoherent unit, the characteristics of folds, from north to south, developed from upright fold to reclined fold to overturned fold, revealing a progressive deformation assemblage associated with the top-to-the-NNE shearing. Combined with top-to-the-NNE thrust fault in the south incoherent unit, it is indicated that these folds and thrust faults are as the product of the SSW-ward subduction of the North Altun ocean. In addition, folds with axial surface dipping to NNE and top-to-the-SSE thrust faults are common in the north incoherent unit, implying that the North Altun ocean has also experienced NNE-ward subduction during the Early Paleozoic. Thus, it is proposed that the North Altun ocean is characterized by divergent double subduction.
- mélange /
- fold /
- thrust fault /
- tectonic evolution /
- Early Paleozoic /
- North Altun
注释:

责任编辑：吴芳

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图 1 北阿尔金大地构造位置及其区域地质简图

a-青藏高原大地构造格架图; b-阿尔金山构造简图^[10]; c-北阿尔金区域地质简图^[21~22]

Figure 1. Geotectonic location and simplified regional geological map of North Altun

下载: 全尺寸图片幻灯片

图 2 北阿尔金恰什坎萨依沟蛇绿混杂岩构造地质图及其典型褶皱构造的野外照片

a—南侧混杂单元内发育的紧闭直立褶皱；b—南侧混杂单元内发育的宽缓直立褶皱；c—南侧混杂单元内发育的斜歪褶皱；d—北侧混杂单元内发育的斜歪褶皱；e—南侧混杂单元内发育的倒转褶皱

Figure 2. Detailed structural map of the ophiolitic mélange and field photographs of typical folds in the Qiashenkansayigou area, North Altun

下载: 全尺寸图片幻灯片

图 3 恰什坎萨依地区正长斑岩脉野外、镜下照片以及岩脉的锆石年龄特征

Kfs—钾长石；Q—石英
a—正长斑岩脉野外产出照片；b—正长斑岩脉显微镜下照片；c—正长斑岩脉锆石阴极发光图像；d—正长斑岩脉锆石U-Pb年龄谐和图

Figure 3. Field and microscope photographs of the syenite porphyry dyke in the Qiashenkansayigou area and its zircon age characteristics

下载: 全尺寸图片幻灯片

图 4 北阿尔金恰什坎萨依沟构造剖面图及其逆冲断层野外照片和赤平投影

a、b—南侧混杂单元内发育的逆冲断层；c、d—北侧混杂单元内发育的逆冲断层；e—恰什坎萨依沟构造剖面图及其逆冲断层赤平投影

Figure 4. Cross section of the ophiolitic mélange and stereographic projections showing structural characteristics of thrust faults in the Qiashenkansayigou area, North Altun

下载: 全尺寸图片幻灯片

图 5 北阿尔金恰什坎萨依沟地区南侧混杂单元内递进褶皱变形的示意图

Figure 5. Schematic diagram of progressive fold deformation in the south incoherent units, Qiashenkashayi area, North Altun

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表 1 恰什坎萨依沟南侧混杂单元内的正长斑岩脉SHRIMP锆石U-Pb分析结果

Table 1. SHRIMP U-Pb dating for zircons of syenite porphyry dyke in the south incoherent units in Qiashenkansayigou area

测点号	U (×10^-6)	Th (×10^-6)	²³²Th/ ²³⁸U	总²³⁸U/ ²⁰⁶Pb	误差 (±%)	总²⁰⁷Pb/ ²⁰⁶Pb	误差 (±%)	²⁰⁶Pb/ ²³⁸U	误差 (±%)	²⁰⁷Pb/ ²⁰⁶Pb	误差 (±%)	²⁰⁶Pb/ ²³⁸U(Age)^①	误差 (1σ)	²⁰⁶Pb/²³⁸U (Age)^②	误差 (1σ)
1	82.79	33.98	0.42	15.11	1.6	0.0603	3.3	0.0564	3.6	0.0659	1.6	410.4	±6.4	411.2	±6.9
2	173.63	109.75	0.65	14.95	1.2	0.0565	2.3	0.0551	2.3	0.06675	1.2	416.6	±5.0	416.6	±5.5
3	109.22	96.02	0.91	15.19	1.4	0.057	3.7	0.0514	4.2	0.06536	1.4	409.9	±5.7	408.2	±6.7
4	375.01	112.39	0.31	15.19	1	0.05662	1.6	0.05569	1.6	0.06574	1	410.1	±4.1	410.5	±4.2
5	206.98	182.76	0.91	14.23	1.1	0.0801	1.8	0.0564	2.7	0.0682	1.1	424.7	±4.8	425.3	±5.9
6	237.47	147.68	0.64	15.18	1.1	0.0571	1.9	0.0581	1.9	0.06596	1.1	410.2	±4.4	411.8	±4.9
7	309.51	175.31	0.59	15.05	1	0.0563	2.1	0.0551	2.2	0.06637	1	414.2	±4.2	414.2	±4.5
8	185.84	92.24	0.51	14.66	1.2	0.0572	2.1	0.0564	2.2	0.06816	1.2	424.5	±4.9	425.1	±5.2
9	152.35	78.41	0.53	14.1	1.2	0.09	2.3	0.0535	4.1	0.06772	1.2	423.3	±5.1	422.4	±6.1
10	82.26	69.46	0.87	14.49	1.5	0.059	3.3	0.0464	4.2	0.068	1.5	428.4	±6.5	423.9	±7.6
11	414.50	177.60	0.44	14.89	0.97	0.05587	1.5	0.05528	1.5	0.06711	0.97	418.7	±4.0	418.7	±4.2
12	298.76	126.04	0.44	14.97	1	0.05579	1.8	0.05764	1.7	0.06695	1	416.5	±4.3	417.8	±4.5
13	360.34	166.38	0.48	14.58	1.3	0.05641	1.6	0.05656	1.6	0.06862	1.3	427.2	±5.4	427.9	±5.9
14	267.46	165.00	0.64	14.86	1.1	0.0585	1.9	0.0566	2	0.06715	1.1	418.2	±4.6	418.9	±5.0
注：误差为1σ; Pb_c和Pb分别代表普通铅和放射性成因铅; ①为假设²⁰⁶Pb/²³⁸U-²⁰⁴Pb/²³² Th年龄谐和校正普通铅; ②为假设²⁰⁶Pb/²³⁸U-²⁰⁷Pb/²³⁸U年龄谐和校正普通铅

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