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东天山黄山-镜儿泉过铝花岗岩矿物学、地球化学及年代学研究被引量:19
2008年
对东天山黄山-镜儿泉一带黄山南、镜儿泉、图拉尔根沟三个过铝花岗岩作了岩相学、矿物学、地球化学、Sr-Nd同位素和锆石U-Ph年代学研究。锆石U—PbLA-ICP-MS原位定年测得黄山南岩体结晶年龄为259.9±1.4Ma(MSWD=0.86),图拉尔根沟岩体结晶年龄为275.4±8.3Ma(MSWD=29),均侵位于二叠纪碰撞后伸展环境。三个过铝花岗岩均具有低锶同位素初始比值(Ist=0.6969~0.70396)、高εNd(t)值(+5.5-+7.2)以及年轻的亏损地幔单阶段模式年龄(tDM=0.48—0.56Ga),表明其岩浆源区均为来源于亏损地幔的新生地壳岩石。这种新生地壳岩石可能为偏酸性的火山岩。三个岩体的矿物学和地球化学可分为两类:一类以黄山南白云母花岗岩为代表,为强过铝花岗岩(A/CNK〉1.1),强烈亏损Ba、Sr和Ti而富集Cs、Rb和K,具有高的Rb/Sr(2.03~14.5)和Al2O3/TiO2(110—1592),低的Nb/Ta(3.24~6.76)比值,其稀土元素配分曲线呈“V”字形,显示强烈铕亏损(Eu/Eu^*=0.04~0.55),表明这类岩体的直接源岩以泥质岩为主。另一类以图拉尔根沟二云母花岗岩为代表,为弱过铝(1〈A/CNK〈1.1)花岗岩,亏损Nb、Ta和Ti而富集Rb、Ba和K,具低的Rb/Sr(0.44~0.69)、Al2O3/TiO2(135~205)和较高的Nb/Ta(12.8—18.4),其稀土元素配分曲线向右陡倾斜,铕负异常不显著(Eu/Eu^*=0.65—0.96),表明其直接源岩以碎屑岩为主。镜儿泉岩体的岩石化学多变性表明,该岩体不同地段的岩浆分别来自以泥质岩为主和以碎屑岩为主的源区,来自两种源区的岩浆在岩体结晶之前未能充分混均。黄山南岩体和图拉尔根沟岩体中继承性锆石的志留、泥盆和石炭纪年龄表明,作为这两个岩体直接源区的泥质岩和碎屑岩可能是志留、泥盆和石炭纪新生亏损幔源岩石经历�
唐俊华顾连兴张遵忠吴昌志三金柱汪传胜刘四海黎广荣
关键词:过铝花岗岩部分熔融锆石U-PB定年东天山
Early Indosinian Weiya Gabbro in Eastern Tianshan, China: Elemental and Sr-Nd-O Isotopic Geochemistry, and Its Tectonic Implications被引量:9
2007年
The Weiya gabbro in eastern Tianshan was formed during the early Indosinian. This rock, with low ratios of Ce/Pb (5.74-10.16), is notably characterized by enrichment in large ion lithophile elements (LILE), such as Rb, K, Ba and Pb, and in high field strength elements (HSFE), such as U and Th, but depletion in Nb and Ta. All samples of the Weiya gabbro display similar chondrite-normalized patterns with moderate enrichment in LREE (72.58-135.61ppm), moderate depletion in HREE (15.26-25.31ppm) and mild fractionation between LREE and HREE (L/ H=4.09-5.98). The average initial Sr value of the rock is 0.7069, and δ18O values of the rock range from 5.67‰-8.04‰. In terms of Nd isotope ratios, the Weiya gabbro is characterized by positive eNd(t) values (0.52-0.76). All these characteristics indicate that the source region of the Weiya gabbro was metasomatized by fluids released from subducted young continental crust, with limited crustal contamination during magma ascent and emplacement. Continental (A-type) subduction was induced by northward subduction of the Paleo-Tethyan oceanic plate during the latest Permian to Triassic. From this point of view, it is supposed that tectonic conversion from the Paleo-Asian to the Paleo-Tethys regime occurred during the latest Permian or earliest Triassic.
ZHANG ZunzhongGU LianxingWU Changzhi
关键词:XINJIANG
青海锡铁山铅锌矿床的矿体成因类型讨论被引量:18
2008年
在青海锡铁山大型铅锌矿床中,奥陶系滩涧山群3个不同层位(O3tnb组片岩、O3tnb组片岩与大理岩过渡带、O3tna-2组片岩)同时发育层状矿体和脉状矿体,大理岩中还发育不规则囊状矿体。通过对上述不同层位、不同类型矿体的分布特征、产状、矿石结构和构造的详细观察和研究发现,3个层位的层状矿体均是SEDEX型海底喷流沉积作用的结果。O3tnb组片岩及其与大理岩过渡带中的层状矿体属近源(proximal)产物,与之伴生的脉状矿体则属该层状矿体的喷流沉积补给带;O3tna-2组片岩中的层状矿体属远源(distal)沉积,而大理岩中的不规则囊状矿体则是造山后深部流体活化围岩或再活化早期层状矿体中的成矿物质,并强烈交代大理岩的产物;北侧O3tna-2组片岩中的脉状矿体也为造山后流体叠加的产物,可能是大理岩中不规则囊状矿体的导矿通道。
吴昌志顾连兴冯慧张遵忠刘四海黄建华王长华王震宇
关键词:铅锌矿SEDEX锡铁山
中天山白石头泉岩体年代学、岩石成因及构造意义被引量:10
2008年
白石头泉岩体位于中天山北缘边界断裂(沙泉子断裂)南侧。该岩体从下至上可分为五个连续过渡的岩相带,即淡色花岗岩(a 带),含天河石花岗岩(b 带),天河石花岗岩(c 带),含黄玉天河石花岗岩(d带)以及黄玉钠长花岗岩(e 带),其中,b、c、d 和 e 带均为 a 带分异的产物。白石头泉岩体的 LA-ICP-MS 锆石 U-Pb 定年结果表明,该岩体侵位于早二叠世早期(295.6±1.3Ma),并于印支期(~214Ma)经历了一次热事件的改造。淡色花岗岩在主量元素上富硅(SiO_2=74.93%~76.18%)、富碱(K_2O+Na_2O=8.07%~8.80%)、富钠(K_2O/Na_2O=0.82~0.89),贫钙、镁,而在微量元素上富 Rb、F 和 Ga (Al/Ga 比值为2217~3134),贫 Ba、Sr 和 Eu 并具强烈的铕负异常(δEu=0.0020~0.0091),反映出其源区为富含白云母的片岩(或片麻岩),成岩压力较低,温度大于860℃。结合区域地质特征,作者等认为白石头泉岩体形成于相对拉张的构造背景,是中-上地壳源岩经历高温贫水熔融的产物,其形成与幔源岩浆内侵作用有关。
刘四海吴昌志顾连兴张遵忠唐俊华黎广荣雷如雄汪传胜
关键词:天河石淡色花岗岩中天山
Characteristics of soure region and tectonic implications of Early Indosinian Weiya gabbroic rock,eastern Tianshan mountains被引量:1
2008年
Based on the detailed petrographic study,the characteristics of source region of the Weiya gabbro and tectonic implications were studied.The results show that the gabbroic rock consists mainly of gabbro,with less amount of ultra-mafic rocks.The ultra-mafic rocks show cumulate texture and are gradually transitional contact with gabbro,indicating that they are cumulate products of parental magma.The ultra-mafic rocks consist mainly of spinel periodite and spinel clinopyroxenite.The former is mainly composed of olivine(65%-70%),spinel(10%-15%),hornblende(5%-10%) and phlogopite(5%-10%);the latter consists mainly of clinopyroxene(70%-80%),spinel(15%-20%) and phlogopite(0-10%),with minor amounts of carbonate(0-2%).No olivine or orthopyroxene is found.The gabbro is composed mainly of clinopyroxene(35%-40%),plagioclase(An 55-65,40%-45%),hornblende(5%-15%),with variable amounts of carbonate(0-5%).Petrographic observations show that the source region of the Weiya gabbroic rock is water-rich due to intensive intra-continental A-type subduction occurring in this region during late Permian to early Triassic.
张遵忠顾连兴邵毅许建荣翟建平吴昌志郑远川唐俊华汪传胜三金柱
关键词:PETROGRAPHYGABBROINDOSINIAN
Initial Geometry and Strike-Slip Deformation of Skarn Related Iron Deposit: Insights from Paleomagnetic and AMS Investigations(Yamansu Deposit, Eastern Tianshan, China)
2013年
The eastern Tianshan has great economic potential with Fe-(Cu)skarn,Cu-Ni-and V-Ti othomagmatic deposits and orogenic Au lodes.In this province the timing relation between Fe-(Cu)skarn-related deposits and the deformation is poorly constrained.This study aims to give argument for the chronology between Fe-(Cu)skarn stage
黎广荣BRANQUET YannickBARBANSON LucSIZARET Stanislas
关键词:TIANSHANEASTERNOROGENICEASTERN
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