张开均
主要研究领域包括青藏高原地质及其演化、中国东部岩石圈演化、中国南部边缘海地质及其演化等
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- 姓名:张开均
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学术头衔:
博士生导师
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学科领域:
地质学
- 研究兴趣:主要研究领域包括青藏高原地质及其演化、中国东部岩石圈演化、中国南部边缘海地质及其演化等
张开均,研究员,理学博士,博士生导师。中国科学院“百人计划”入选者,《沉积学报》、《古地理学报》、《南京大学学报(自然科学)》、《Open Mineralogy Journal》编委。主要研究方向和兴趣为中国区域板块构造和盆地构造等,目前主要研究领域包括青藏高原地质及其演化、中国东部岩石圈演化、中国南部边缘海地质及其演化等。
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张开均, Kai-Jun Zhang, , Yu-Xiu Zhang, Xian-Chun Tang, Yao-Wu Xie, Shao-Li Sha and Xing-Jie Peng
Terra Nova, Vol 20, No.4, 302-308,-0001,():
-1年11月30日
Eclogites characterized by a garnet+clinopyroxene+orthopyroxene+sanidine+rutile assemblage are reported for the first time in the eastern Bangong suture, central Tibet (China). Garnet and sanidine are exsolved from clinopyroxene. Al-exchange barometer for orthopyroxene and garnet and K concentrations in clinopyroxene indicate a peak pressure of 4 GPa. The occurrence of these ultrahigh-pressure rocks implies the subduction of continental crust to a depth of>130km along the eastern Bangong suture zone during the Early Jurassic. The denudation of these ultrahigh-pressure metamorphic rocks could have provided a significant source for the Jurassic turbidites in the western Bangong ocean basin.
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张开均, Kai-Jun Zhang a, b, *, Bing Li a, c, Qing-Guo Wei a, Jian-Xin Cai a, Yu-Xiu Zhang a, d
Sedimentary Geology 208(2008)36-44,-0001,():
-1年11月30日
The Late Triassic Songpan-Ganzi turbidite complex on the eastern Tibetan plateau, which covers an area of-2.2
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【期刊论文】INTENSE LATE CENOZOIC CRUSTAL SHORTENING IN SOUTHERN QIANGTANG, WESTERN CHINA
张开均, K. J. ZHANG, Q. F. WANG, H. N. LU, B. G. ZHANG, B. D. XIA, G. M. WANG
JOUR. GEOL. SOC. INDIA, VOL. 60, SEPT. 2002,-0001,():
-1年11月30日
The magnitude of Cenozoic crustal shortening within the Tibetan plateau is a question of key importance in the models for its development. Earlier investigators proposed that the Cenozoic shortening within the plateau is generally less than 40%. Here, we present two exactly constrained structural sections, which show that the late Cenozoic crustal shortening within southern Qiangtang is upto 57-67%. This indicates that the internal crustal shortening within the plateau can play a vital role in the doubling of the crust of the Tibetan plateau.
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【期刊论文】Is the Songpan-Ganzi Terrane (Central China) Really Underlain by Oceanic Crust?
张开均, K. J. Zhang
JOURNAL GEOLOGICAL SOCIETY OF INDIA Vol. 57, March 2001, pp. 223-230,-0001,():
-1年11月30日
The Songpan-Ganzi terrane of central China has long been believed to be floored by oceanic crust. However, several recent deep seismic profiles across the terrane reveal that it could be underlain by Precambrian continental crust. In general. The upper crust of the terrane with a P velocity of less than 6.35 km/s is about 29-32 km thick and could consist of Mesozoic and Paleozoic sedimentary rocks and Precambrian basement. Within the terrane there exist two suites of Permo-Triassic sedimentary rocks in tectonic contact with each other. These suites were deposited in two distinct settings: a flysch association and a carbonate-coarse grained clastics association formed in a stable platform environment. The Songpan-Ganzi terrane is also characterized by consistently northeasterly verging folds and thrusts and by subsequent strike slip movements, with the main thrusts and detachments occurring between the Permo-Triassic flysch association and the continental crust and between the upper and lower crusts. The detachments are highlighted by steady low velocity zones. A new tectonic model is presented for the Mesozoic evolution of the Songpan-Ganzi terrane. The Permo-Troassoc flysch present in the terrane is proposed to represent allochthonous flakes that were thrust over the lower para-autochthonous Sinian-Triassic continental sedimentary rocks of the terrane. Concurrently, the Precambrian basement could have detached from the lower crust and could have been transported northeastwards. The deformation mainly resulted from the mid-Mesozoic suturing between the Songpan-Ganzi and Qiangtang terranes and represents a product of multiphase collision between the Tethyan terranes through the Mesozoic.
Flysch, Crustal structure, Continental basement, Continental subduction, Tectonic evolution, Songpan-Ganzi terrane, Northeastern Tibet
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张开均, Kai-Jun Zhang
Earth and Planetary Science Letters 229 (2004) 73-89,-0001,():
-1年11月30日
eposited. The spatial–temporal variation of both sediment maturity indices (SiO2/Al2O3, La/V, and Zr/TiO2), the ratios of immobile trace elements (Cr/Th, Th/Sc, Th/Co, La/Sc, and La/Co), and SiO2, K2O/Na2O, Eu/Eu, (Gd/Yb)n, and ferromagnesian contents, displays that the Berriasian–Valanginian (BV) sediment could have been derived from northern orogenic source areas, whereas the Hauterivian–Lower Barremian (HB) sediment could have been closely related to the syndepositional volcanism in the northern Lhasa block itself. The Na2O/Al2O3–K2O/Al2O3 relations also place approximately half of HB samples in the field of volcanic rocks of back-arc rifting origin, whereas little volcanic clasts exist in the BV rocks. There are distinct signatures that the mafic/ultramafic materials in the BV rocks were derived from oceanic island basalts (ophiolites) in the Bangong–Nujiang suture. Therefore, the collisional orogen due to the Qiangtang–Lhasa collision should have played a key role in supply of the sediments during BV time. Bimodal sedimentary basaltic and rhyolitic tuffs, with respective distinguished geochemical features, exist in the HB sequence. Therefore, a distinct tectonic transition from continental collision to back-arc rifting in central Tibet is believed to have occurred during Early Cretaceous time. Extreme depletion of Na of most Lower Cretaceous samples compared to the upper crust, and their high average chemical index alteration (CIA) values and Th/U ratios, point out the source rocks formed in tropical climatic regions with little tectonic uplift, although the weathering degree of the source rocks for HB samples could likely have been affected by the syndepositional volcanism. During Middle Cretaceous time, the entire southern Eurasian margin could have been characterized by a series of back-arc rift basins (including those in Kohistan and Ladakh).
Tibet, Gangdese arc, Bangong–Nujiang suture, Early Cretaceous, geochemistry, sediments, continental collision, back-arc rifting, weathering
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张开均, . Zhang, Y.X., Zhang, K.J., Li, B., Wang, Y., Wei, Q.G., Tang, X.C.
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-1年11月30日
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张开均
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【期刊论文】Eclogites from central Qiangtang, northern Tibet (China) and tectonic implications
张开均
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-1年11月30日
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