Science in China Series D: Earth Sciences

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A high-resolution climatic change since the Late Glacial Age inferred from multi-proxy of sediments in Qinghai Lake
Science in China Series D: Earth Sciences - Tập 48 Số 6 - Trang 742-751 - 2005
Ji Shen, Xingqi Liu, Ryo Matsumoto, Sumin Wang, Xiangdong Yang
Genetic model of hanging wall syncline and central dome in extensional fault
Science in China Series D: Earth Sciences - Tập 45 - Trang 440-448 - 2002
Delai Liu, Guiming Ding, Bing Lu
Hanging wall syncline and central dome are special extension structures, developing over the hanging wall in an extensional ramp-flat fault. Under the condition that the flat is sub-horizontal, the hanging wall syncline is separated from the half graben by the central dome. And on the dome forms an erosional surface. Both sediments in the half graben and erosional surface on the top of the central...... hiện toàn bộ
Microstructure characteristics of illite from Chuanlingou Formation of Changcheng System in Jixian County, Tianjin City
Science in China Series D: Earth Sciences - Tập 50 - Trang 1452-1458 - 2007
Tao Chen, HeJing Wang
The microstructure characteristics of illite from the Chuanlinggou Formation of Changcheng System (Chch) in Jixian County, Tianjin City has been studied by means of high-resolution transmission electron microscopy (HRTEM), selected-area electron diffraction (SAED), X-ray energy dispersive spectrum (EDS) and X-ray powder diffraction (XRD). The Kübler index of “illite crystallinity” is 0.505° Δ2θ, w...... hiện toàn bộ
Laser probe 40Ar-39Ar ages of metasomatic K-feldspar from the Hougou gold deposit, northwestern Hebei Province, China
Science in China Series D: Earth Sciences - Tập 45 - Trang 559-564 - 2002
Xingwang Xu, Xinping Cai, Yulin Liu, Baolin Zhang
The Hougou gold deposit in northwestern Hebei is a typical K-metasomatism-related gold deposit hosted by K-altered rocks overprinting alkali intrusive rocks. In order to determine the age and pulse intervals of K-metasomatism in this gold deposit, some metasomatic K-feldspars from K-altered rocks are selected to measure their formation time by laser probe 40Ar-39Ar dating method. The new analyzing...... hiện toàn bộ
Single zircon LA-ICPMS U-Pb dating of Weishan granite (Hunan, South China) and its petrogenetic significance
Science in China Series D: Earth Sciences - Tập 49 - Trang 816-827
Hongye Huang, Weifeng Chen, Xing Ding, Peirong Chen, Xinmin Zhou
A detailed microstructure analysis and LA-ICPMS U-Pb dating have been done for zircons of Weishan granite from Hunan Province, South China. The results indicate that the Weishan granite is a multistage batholith formed during the late Indosinian-early Yanshanian time. The intruded time of the late Indosinian granite is 211.0±1.6Ma and 215.7±1.9Ma (two samples), whereas that of the early Yanshanian...... hiện toàn bộ
Late Mesozoic crust-mantle interaction and lower crust components in South China: A geochemical study of mafic granulite xenoliths from Cenozoic basalts
Science in China Series D: Earth Sciences - Tập 46 - Trang 447-460 - 2003
Jinhai Yu, Xisheng Xu, Xinmin Zhou
Mafic granulite xenoliths collected from Cenozoic basalts in SE China can be classified as magmatic granulite and cumulate granulite. Magmatic granulites are characterized by highly concentrated AI2O3, K2O, P2O5, Ba, Sr, Pb and REE, and low contents of Nb, Zr, Hf and Th, and have an incompatible element abundance pattern similar to that of continental arc basalts. Cumulate granulites are depleted ...... hiện toàn bộ
Properties of soils in Grove Mountains, East Antarctica
Science in China Series D: Earth Sciences - Tập 46 - Trang 683-693 - 2003
Xiaoli Li, Xiaohan Liu, Yitai Ju, Feixin Huang
Three cold desert soil sites were first found in the southern Mount Harding, Grove Mountains, East Antarctica. The soils are characteristics of the widespread occurrence of surface desert pavement, abundant water-soluble salts, strongly stained upper portion of soil profile, slightly acid and negligible organic matter content. A 1:5 soil-water extracts analysis indicates that the dominant cations ...... hiện toàn bộ
Periodical mixing of MORB magmas near East Pacific Rise 13°N: evidence from modeling and zoned plagioclase phenocrysts
Science in China Series D: Earth Sciences - Tập 51 - Trang 1786-1801 - 2008
GuoLiang Zhang, ZhiGang Zeng, XueBo Yin, DaiGeng Chen, XiaoYuan Wang, XiaoMei Wang
Thirty-six basalt samples from near East Pacific Rise 13°N are analyzed for major and trace elements. Different types of zoned plagioclase phenocrysts in basalts are also backscatter imaged, and major element profiles scanned and analyzed for microprobe. Basalts dredged from a restricted area have evolved to different extents (MgO=9.38wt%—6.76wt%). High MgO basalts are modeled for crystallization ...... hiện toàn bộ
Influences of local factors on permafrost occurrence and their implications for Qinghai-Xizang Railway design
Science in China Series D: Earth Sciences - Tập 47 - Trang 704-709 - 2004
Guodong Cheng
The construction of the Qinghai-Xizang Railway is facing some challenges posed by the presence of warm and ice-rich permafrost and predicted climate warming. To resolve these issues and ensure the railway a success, adjustments will have to be made in design strategies and principles. This paper presents several examples of permafrost-distribution anomaly caused by site-specific conditions. It ana...... hiện toàn bộ
Prediction of the trend of total column ozone over the Tibetan Plateau
Science in China Series D: Earth Sciences - Tập 44 - Trang 385-389 - 2001
Yu Liu, Weiliang Li, Xiuji Zhou
By using 2-D chemical model, the trend of total column ozone over the Tibetan Plateau is simulated. The results show that from 1980 to 1993, the total column ozone over the Tibetan Plateau decreases; after 1995, it starts to recover. But until 2050, it will not still reach the level of 1980 total column ozone. Under Tibetan special circulation, its total column ozone recovers more rapidly than zon...... hiện toàn bộ
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