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In Yadong district in central Himalaya, a retro-metamorphic high-pressure granulite and its country rock were focused and...更多 conventional 40Ar/39Ar tests were done.

在喜马拉雅造山带中东段,系统的针对岩体热史演化的研究尚处于起步阶段,喜马拉雅山的隆升之谜也一直没有彻底解开。

In Jurassic-Paleogene, the West Kunlun, West Tianshan, Tarim and the Central Asia exhibited a relatively quiet period after the orogenic movement. Due to extension, these area displayed peneplain tectonic geomorphologic landscape.

侏罗纪,西昆仑、西天山、塔里木大陆及中亚—带都处于造山期后的相对宁静期,以仲展构造作用为主,主要表现为准平原化的构造地貌景观,沉积有高成熟度的侏罗纪含煤岩系,塔西南表现为陆内伸展盆地,这一时期可持续到早第三纪。

Phosphatic rocks are commonly developed at the bottom of the Cambrian and two or three roughly comparable tillite beds are observed in the Sini-an.

中天山巴仑台微地块中的下石炭统马鞍桥组底部的粗碎屑岩,是碰撞造山中晚期的地质记录。

The gold ore types are mainly cataclastic and altered rock type.

红土沟-川刺沟金矿是一种典型的造山带中的韧性剪切带型金矿床,其主要的矿石类型为构造破碎蚀变岩型金矿石。

The study indicates that the Pb and Zn ore-forming elements probably come from the basement rocks; The initial Pb isotope could be derived from the crust-mantle mixing in the erogenic belt; sulfur isotope composition is enriched in heavy sulfur that may have come from the seawater sulfate in the synchronous sedimentation; the ore is characterized with REE enrichment, obvious fractionation of LREE and flat-pattern of HREE; ore-forming media is thermal brine fluid; both mineralization temperature and pressure are low; the metallogenic epoch is probably in late Dengying epoch of Sinian period.

研究表明,基底岩系可能为成矿元素Pb、Zn的主要来源;原始铅主要来源于壳幔棍合的造山带;硫同位素富集重硫,可能主要来源海水硫酸盐;矿石中稀土元素富集,轻稀土分异较明显,而重稀土分异不明显;成矿流体推测为热卤水性质,成矿温度为中低温,具有低压浅成成矿特点;矿床形成的初期应始于震旦纪灯影世晚期。

The Dahalajunshan Formation dominated lithologically by calc-alkaline volcanic rocks constitutes a complete island arc volcanic sequence; whereas the Aikendaban Formation with dominance of alkaline-subalkaline volcanic rocks belongs to shoshonitic sequence formed in the extension of collision-orogeny.

大哈拉军山组火山岩以钙碱性系列为主,构成了一个完整的岛弧演化序列;艾肯达坂组火山岩以偏碱性-碱性系列为主,属于典型的碰撞造山伸展期的橄榄安粗岩系。

The Zhashui granite body, with typical rapakivi texture, is intruded into the nearby Shangdan suture zone of the Qinling orogen.

柞水岩体侵位于秦岭造山带商丹缝合带附近,具有比较典型的环斑花岗结构,本文获得了213.6±1.8 Ma的单颗粒锆石 U-Pb 年龄,MSWD 为 1.5,这个年龄与前人在东秦岭沙河湾环斑花岗岩测定的锆石 U-Pb年龄非常一致。

The comparison of petrology, lithofacies, petro-geochemistry and tectonic environment of the rapakivi granite both from Qinling-Kunlun and world shows that the rapakivi granite has same or consistent characteristics: rapakivi structure, sub-aluminous, high-potassic, alkali-rich magma, two-peak magma assemblage and formed in post-collision environment. However, there are some certain differences in some geochemical index, forming age of magma, and geotectonic position of outcropping.

通过秦岭-昆仑造山带中的环斑花岗岩同世界元古宙环斑花岗岩的岩石学、岩相学、岩石地球化学和构造环境等方面的对比研究发现,二者具有相同或一致的特征:具环斑结构,属准铝、高钾、富碱岩浆,具双峰式岩浆组合,形成于后碰撞环境,但其地球化学的某些指标、岩浆形成时代和出露的大地构造位置等有一定差异。

Mineral chemistry and P-T estimation results of the amphiboles of different occurrences indicate that the eclogite xenoliths were subjected to a clockwise P-T evolutional path, implying that an orogenic event happened in the eastern part of the North China Craton in the early Mesozoic.

不同产状角闪石矿物化学成分的差异和温压估算结果显示,榴辉岩类捕虏体经历了一个顺时针的P-T演化轨迹,进而反映了中生代早期华北克拉通东部造山作用的存在。

By comparison of the deformation degree of these plutons with different time, the paper suggests that during 959-889Ma a sudden peak regional deformation was tacking place in the core of the Qinling orogenic belt, giving the evidence for the subduction of the plate tectonics.

通过不同时间岩体区域变形改造程度的对比,提出959~889Ma秦岭造山带核部发生过突发性峰期变形事件。这从构造变形角度佐证了板块俯冲作用的存在。

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