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国家自然科学基金(40730314)

作品数:15 被引量:183H指数:8
相关作者:朱永峰张立飞吕增安芳宋述光更多>>
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大洋型超高压变质带的地质特征及其研究意义:以西南天山、柴北缘超高压变质带为例被引量:17
2008年
在总结洋壳深俯冲超高压变质带的基本地质特征的基础上,较深入地论述了洋壳深俯冲超高压变质作用研究意义和存在的问题.大洋型超高压变质带的基本特征是以典型的洋壳组合的原岩建造为特征,其变质作用峰期温度较低属于低温榴辉岩相范围,在递进和退变过程中出现蓝片岩相变质过程,具有低的、冷俯冲带的地热梯度,并且在岩石组合方面常常与蛇绿岩带伴生.大洋型超高压变质带的深入研究对于建立冷俯冲带变质反应系列,探讨俯冲带的水流体是如何被带到地幔深处以及建立冷俯冲带超高压变质作用类型都具有重要意义.深俯冲超高压变质洋壳岩石抬升、折返机制的研究是目前超高压变质作用研究最具挑战性的问题之一,其深入研究对于探讨超高压变质作用发生机理、建立更加广泛的超高压变质岩石抬升、折返机制具有重要意义;洋壳深俯冲超高压变质岩作为俯冲到地幔深度又折返到地表的岩石,见证了俯冲与折返的全过程,是研究俯冲变质带中元素地球化学行为及其物质循环的最理想场所之一;洋壳俯冲到陆壳俯冲-碰撞是俯冲碰撞造山带形成演化的基本方式,也是目前板块构造理论研究的前沿领域.同时,对中国西部西南天山和柴北缘2个具有洋壳深俯冲特征的超高压变质带研究现状和存在的问题也展开了讨论。
张立飞吕增张贵宾宋述光
关键词:西南天山柴北缘
Northward subduction-related orogenesis of the southern Altaids:Constraints from structural and metamorphic analysis of the HP/UHP accretionary complex in Chinese southwestern Tianshan,NW China被引量:5
2015年
The Chinese Tianshan belt of the southern Altaids has undergone a complicated geological evolution. Different theories have been proposed to explain its evolution and these are still hotly debated. The major subduction polarity and the way of accretion are the main problems. Southward, northward subduction and multiple subduction models have been proposed. This study focuses on the structural geology of two of the main faults in the region, the South Tianshan Fault and the Nikolaev Line. The dip direction in the Muzhaerte valley is southward and lineations all point towards the NW. Two shear sense motions have been observed within both of these fault zones, a sinistral one, and a dextral one, the latter with an age of 236-251 Ma. Structural analyses on the fault zones show that subduction has been northward rather than southward. The two shear sense directions indicate that the Yili block was first dragged along towards the east due to the cloclkwise rotation of the Tarim block. After the Tarim block stopped rotating, the Yili block still kept going eastward, inducing the dextral shear senses within the fault zones.
Mark ScheltensLifei ZhangWenjiao XiaoJinjiang Zhang
新疆萨尔托海铬铁矿中的Fe-Ni-As-S矿物研究被引量:10
2010年
新疆萨尔托海铬铁矿是一个典型的与蛇绿岩有关的高铝型豆荚状铬铁矿,其中矿石铬尖晶石发生了明显的热液蚀变,发育了富Cr的蚀变环边,形成高铁铬铁矿,Cr#在蚀变后升高,发生了Cr元素的次生富集。在矿石颗粒间隙中的Fe-Ni-As-S矿物组合主要为镍黄铁矿-赫硫镍矿-针镍矿-砷镍矿。围岩纯橄岩普遍发育强烈的蛇纹石化,其中的Fe-Ni-As-S矿物组合为赫硫镍矿-镍黄铁矿-砷镍矿,还有少量的针镍矿和铜矿物。通过对硫化物的成分对比分析,认为矿石中的镍黄铁矿和赫硫镍矿都属于岩浆演化的产物(>600℃),与赫硫镍矿和针镍矿一样,均从贫S的母岩浆中通过岩浆熔离过程形成。围岩和矿石中的含砷矿物以及围岩中的镍黄铁矿都是晚期热液活动的结果,其中砷镍矿具有特殊的蠕虫状-乳滴状结构,与围岩中的赫硫镍矿和镍黄铁矿共生。围岩和矿石中Fe-Ni-As-S矿物组合的形态和成分差异,说明金属矿物的整体演化从岩浆期到热液期经历了从贫S到富As的环境变化,最终形成了现在所观察到的复杂Fe-Ni-As-S矿物组合。
谭娟娟朱永峰
关键词:蛇绿岩豆荚状铬铁矿镍黄铁矿砷镍矿
新疆克拉玛依百口泉蛇绿混杂岩中辉长岩岩石学和地球化学研究被引量:11
2010年
克拉玛依蛇绿混杂岩带百口泉剖面由尖晶石蛇纹岩、辉长岩、玄武岩和硅质岩组成。岩相学研究表明,百口泉辉长岩分为堆晶岩(具堆晶结构)和辉长岩(具辉长结构)两类,且均经历了低-中级变质改造。微量元素地球化学显示其岩浆起源于亏损地幔,强烈的Sr异常和Eu异常表明强烈的斜长石堆晶过程。根据其稀土配分模式推测其源区为尖晶石相的地幔橄榄岩。结合野外地质关系和地球化学特征,白碱滩尖晶石二辉橄榄岩能够代表其源区成分,利用微量元素模拟其岩浆演化过程显示:尖晶石二辉橄榄岩发生2.5%部分熔融所形成的熔体,通过10%~20%分离结晶可以形成堆晶辉长岩,经过80%~90%分离结晶则可以形成具辉长结构的辉长岩。因此,蛇绿混杂岩中零星分布的堆晶岩和辉长岩团块是同源岩浆演化的产物。对分离结晶过程中Nb元素地球化学行为的研究表明,岩浆的结晶分异能够导致辉长岩明显亏损Nb。
陈博朱永峰
关键词:蛇绿混杂岩辉长岩岩浆演化
高温高压下NaCl-H_2O体系的Raman光谱分析:一种新的流体包裹体盐度测定方法被引量:2
2009年
利用水热金刚石压腔研究了高温高压下0.0%、5.0%、10.0%和20.0%的NaCl-H_2O体系的Raman光谱,研究结果发现:对于盐度一定的NaCl-H_2O体系,当压力不变时,水的Raman伸缩谱峰的波数变化量△v_((O-H))随温度的升高而不断增加;当压力不同时,△v_((O-H))随温度的变化关系(偏移斜率S)不受压力的影响,而只与盐度相关。利用该性质可以用来确定流体包襄体的盐度(W),其计算公式如下:W=123.25S^2-128.11S+32.40,误差为0.46%。
杨玉萍郑海飞张立飞刘曦邓松涛
关键词:高温高压RAMAN光谱HIGHHIGHSALINITYSTRETCHING
The geological characteristics of oceanic-type UHP metamorphic belts and their tectonic implications: Case studies from Southwest Tianshan and North Qaidam in NW China被引量:22
2008年
The geological characteristics of ultrahigh-pressure (UHP) metamorphic belts formed by deep subduction of oceanic crust are summarized in this paper. Oceanic-type UHP metamorphic belt is characterized by its protolithic assemblage of typical oceanic crust, the peak metamorphic temperature <600℃, P-T path undergoing blueschist facies during prograde and retrograde metamorphic evolution, respectively, with low geothermal gradient of cold subduction. The further study of oceanic-type UHP metamorphic belt is very significant for constructing metamorphic reaction series of cold subduction zone, for understanding how aqueous fluids were transported into deep mantle and for classifying the types of UHP metamorphism in cold subduction zone. The uplift and exhumation mechanism of oceanic UHP metamorphic rocks is one of the most challenging problems in the study of UHP metamorphism, which is very important for understanding the geodynamic mechanism of solid Earth. As a traveler subducted into the mantle depth and then uplifted to the surface, oceanic-type UHP metamorphic belts witness the bulk process from the subduction to exhumation and is an ideal target to study the geochemical behavior and cycling of elements in subduction zones. The tectonic evolution of one convergent orogenic belt can be usually divided into two stages of oceanic subduction and followed continental subduction and collision, and the two best-established examples of orogenic belts are Alps and Himalaya. Therefore, the study of oceanic-type UHP metamorphic belt is the frontier of the current plate tectonic theory. As two case studies, the current status and existing problems of oceanic-type UHP metamorphic belts in Southwest Tianshan and North Qaidam, NW China, are reviewed in this paper.
ZHANG LiFei LU Zeng ZHANG GuiBin SONG ShuGuang
关键词:地质运动超高压变质带
新疆西准噶尔包古图组凝灰岩锆石SHRIMP年龄及其地质意义被引量:73
2009年
西准噶尔地区出露巨厚层的下石炭统火山-沉积岩,包括太勒古拉组、包古图组和希贝库拉斯组,前人主要通过生物化石来确定各组之间的层位关系,并存在争论。本文对包古图金矿区包古图组中3个蚀变凝灰岩样品开展的锆石SHRIMF年代学研究表明,凝灰岩的年龄分别为328.4Ma(MSWD=0.72)、342.6Ma(MSWD=0.76)和336.5Ma(MSWD=1.6)。结合太勒古拉组年代学数据和下石炭统火山-沉积地层的分布关系,确定西准噶尔下石炭统火山-沉积地层从下到上依次为:希贝库拉斯组、包古图组和太勒古拉组。
安芳朱永峰
关键词:凝灰岩锆石SHRIMP西准噶尔
Determining Pressure with Daughter Minerals in Fluid Inclusion by Raman Spectroscopy:Sphalerite as an Example被引量:3
2009年
Raman frequency of some materials, including minerals, molecules and ions, shifts systematically with changing pressure and temperature. This property is often used as a pressure gauge in high pressure experiments with the hydrothermal diamond anvil cell (HDAC). Since the system of fluid inclusion is similar to that of HDAC, it can also be used to determine the internal pressure of fluid inclusions. Sphalerite is a common daughter mineral. In this study, the frequency shift of the 350 cm-1 peak of sphalerite has been studied from 296 to 523 K and from 0.07 to 2.00 GPa using the HDAC. The global slope of the isotherms (V350/p)T is 0.0048 in the studied pressure range. No significant variation of the slopes with temperature has been observed. The correlation between the frequency shift of the 350 cm-1 peak of sphalerite and pressure and temperature is constrained as P=208.33(△ Vp)350+3.13T-943.75. This relationship may be used to estimate the internal pressure of the sphalerite-bearing fluid inclusions.
YANG Yuping ZHENG Haifei ZHANG Lifei
关键词:PRESSURESPHALERITERAMAN
新疆西南天山木扎尔特河一带低压泥质麻粒岩岩石学特征、独居石U-Th-Pb定年及其地质意义被引量:22
2009年
古南天山洋闭合过程中,由于洋壳俯冲产生的岛弧岩浆作用加热大陆地壳,在新疆西南天山木扎尔特一带形成了一套低压高温泥质麻粒岩相变质岩石。本文用Theriak-Domino热力学软件对该套岩石中的堇青石榴夕线石黑云母片麻岩和含夕线石堇青石榴黑云母片麻岩进行了岩石学相平衡计算研究,得到它们峰期变质的温压条件分别是:T=630~674℃,P=5.2~5.5kbar和T=645~684℃,P=5.4~5.7kbar。并采用独居石Th-U-Pb电子探针定年方法,对样品WQ006中的3颗独居石进行了原位年龄测定(38个分析点),得到2组等时线年龄,分别是376±8Ma和280±8Ma(2σ)。结合独居石的岩相学特征,提出了新疆西南天山低压高温麻粒岩相峰期变质作用的时代为280±8Ma,而376±8Ma(2σ)可能为原沉积岩的原岩/成岩年龄。表明西南天山洋壳开始俯冲发生在晚古生代,进一步证明了西南天山造山带俯冲碰撞发生在晚二叠纪之后的观点。
苟龙龙张立飞G0U
关键词:低压岩石学特征独居石定年地质意义TIANSHANTIANSHAN
Coesite in the eclogite and schist of the Atantayi Valley, southwestern Tianshan, China被引量:9
2012年
Coesite is an indicator mineral of ultra-high-pressure metamorphism. Since coesite was reported in the Habutengsu Valley, we have also found it in eclogite and schist from the Atantayi Valley in the southwestern Tianshan, China. Petrographic and micro-Raman analyses were carried out for the Atantayi metamorphic rocks and coesite was recognized in the predominant rock types, i.e. schist and eclogite, from three sections. The coesite-bearing schist consists mainly of garnet, Na-Ca amphibole, quartz, white mica and albite; the coesite-bearing eclogite is mainly composed of omphacite, garnet, glaucophane and zoisite. The coesite occurs as various mineral inclusions within porphyroblastic garnet. Findings of coesite in eclogite and associated schist indicate not only the regional in situ formation of the Atantayi ultra-high-pressure eclogite, but also the large areal extent of ultra-high-pressure metamorphism in southwestern Tianshan, extending up to 10 km north-south and 60-80 km east-west.
LÜ ZengZHANG LiFei
关键词:石英片岩超高压榴辉岩超高压变质变质矿物
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