Double Convective Hydrothermal System beneath Massive Sulfide Orebody in Gacun Deposit,Southwestern China     

Hou ZengqianInstitute of Mineral Deposits  CAGS  Beijing Mo Xuanxue Department of Geology  Mineral Resources  China University of Geosdences  Beijing Urabe Tetsuro Geological Survey of Japan  Higash --  Tsukuba  Ibaraki    Japan 《中国地质大学学报(英文版)》1995,(2)

The Gacun Kuroko-type deposit, Southwestern China, is hosted in rhyolitic rocks associated with the underlying mafic rocks occurred in the ～1000 m deep fault-hounded basin within the intra-arc rifting zone which formed on the Triassic Yidun island-arc. Two vertically separated alteration systems are recognized: one is conformable or semiconformable alteration zone developed in ～150 m thick mafic unit 1-1.5 km below the massive sulfde orehody; the other is discordant alteration pipe directly surrounded around stockwork ore within rhyolitic unit. The lower conformable alteration zone extending for several kilometers along strike is characterized by silicification and epidotization which result in the development of quartz vein and quartz-epidote vein systems in mafic lava flows and replacement of primary minerals and groundmass in spilitized mafic volcanics and dikes by quartz, epidote-group minerals and sodic plagiocluse. Sulfides often occur in the vein system and altered mafic volcanics. Quartz solubi  相似文献   

The　optimum　source－time　function　for　generating　finite－difference　synthetic　seismograms     

Abdolrahim JAVAHERIAN 《地震学报(英文版)》1994,7(1):23-31

Ｔｈｅｏｐｔｉｍｕｍｓｏｕｒｃｅ－ｔｉｍｅｆｕｎｃｔｉｏｎｆｏｒｇｅｎｅｒａｔｉｎｇｆｉｎｉｔｅ－ｄｉｆｆｅｒｅｎｃｅｓｙｎｔｈｅｔｉｃｓｅｉｓｍｏｇｒａｍｓＡｂｄｏｌｒａｈｉｍＪＡＶＡＨＥＲＩＡＮ（ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，ｔｈｅ...  相似文献   

New Aspects of Extragalactic Globular Clusters     

Myung Gyoon Lee 《天文研究与技术》1999,(Z1)

1　ＩｎｔｒｏｄｕｃｔｉｏｎＧｌｏｂｕｌａｒｃｌｕｓｔｅｒｓａｒｅｃｏｎｓｉｄｅｒｅｄｔｏｂｅｔｈｅｏｌｄｅｓｔｓｔｅｌｌａｒｓｙｓｔｅｍｓｉｎｇａｌａｘｉｅｓｓｏｔｈａｔｔｈｅｙｋｅｅｐａｆｏｓｓｉｌｒｅｃｏｒｄｏｆｅａｒｌｙｈｉｓｔｏｒｙｏｆｇａｌａｘｉｅｓ .Ｔｈｅｙａｒｅｓｏｂｒｉｇｈｔｔｈａｔｔｈｅｙｃａｎｂｅｏｂｓｅｒｖｅｄｅｖｅｎｉｎｄｉｓ ｔａｎｔｇａｌａｘｉｅｓ,ａｎｄｔｈｅｙａｒｅａｂｕｎｄａｎｔｉｎｇａｌａｘｉｅｓ,ｅｓｐｅｃｉａｌｌｙｉｎｇｉａｎｔｇａｌａｘｉｅｓｗｈｉｃｈｈａ…  相似文献   

Mountain evolution and environmental changes of Huangshan (Yellow mountain),China     

HUANG Pei-hu  R.F. Diffendal  Jr.  YANG Min-qing  P.E. Helland 《地理学报(英文版)》1999,(1)

Huangshan(Yellowmountain)islocatedinsouthernpoofthelowerreaChesoftheYangtZemyer,30'31'Nand118"if'E.ItShigheStLotUSFlowerPeakis1864mabovesealevel.ItisoneofthetencelebretedscenicSPOtSinChinaandwasincludedintheWorldNaturalandCultulalHeritageListbyU'NESCOin1990.OneofthemajorreasonsforincludingitinthelistisbecauseofHuangshan'simPOrtantvalueforgeologicalacgeomorphicscienceicresearches.Inthe~es,Lee(1936)proPOsedthe"confinnatoryevidenceofPleistoceneglacinhonfromtheHuangshan"l'l.Inthesi…  相似文献   

The Gifford Creek Ferrocarbonatite Complex, Gascoyne Province (Western Australia): a Putative Link to the 1075 Ma Warakurna Large Igneous Province     

Franco PIRAJNO  Ignacio GONZáLEZ -áLVAREZ  CHEN Wei  Kurt T. KYSER  Antonio SIMONETTI  Evelyne LEDUC  Monica LeGRAS 《地质学报》2014,88(Z2):431-432

Please refer to the attachment(s) for more details.  相似文献   

Abstracts of the Third IGCP-649 Workshop to Investigate the Mayari-Baracoa Ophiolite in Cuba Havana Cuba, April 3-14, 2017     

《第三届国际地科联资助项目 《《地质学报》英文版》2017,91(Z1)

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The 9th National Member Congress and the 16th Academic Annual Meeting of the Chinese Society for Mineralogy, Petrology and Geochemistry，18-21April,2017.Xi’an     

《中国矿物岩石地球化学学会第九次全国会员代表大会暨第  届学术年会》论文摘要集 《《地质学报》英文版》2017,91(Z1)

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Release of mercury from intertidal sediment to atmosphere in summer and winter     

LIU Ruhai Under the auspices of National Natural Science Foundation of China 《中国地理科学(英文版)》2010,20(2):99-105

The release of mercury from intertidal sediment to atmosphere was studied based on the simulated experiment. The experiment samples were collected from the Haibo Estuary (S1) and the Licun Estuary (S2) of the Jiaozhou Bay in China,which are seriously polluted with mercury. The results show that the mercury in sediment releases rapidly to atmosphere under solar radiation. After 8 hours of solar radiation,mercury concentrations decrease from 5.62 μg/g and 2.92 μg/g to 2.34 μg/g and 1.39 μg/g in S1 and S2 sediments respectively in summer,and decrease from 5.62 μg/g and 2.92 μg/g to 4.58 μg/g and 2.13 μg/g respectively in winter. The mercury species in the sediment change markedly under solar radiation. The concentrations of mercury bound to organic matter decrease significantly from 2.73 μg/g to 0.31 μg/g in S1 and from 2.07 μg/g to 0.31 μg/g in S2,and the released mercury mainly comes from mercury bound to organic matter. Mercury flux shows distinguishing characteristic of diurnal change,and it increases rapidly in the morning with the rising of solar radiation intensity,but decreases in the afternoon. The mercury flux increases with sediment temperature and solar radiation intensity. The rapid release of mercury in intertidal sediment plays an important role in the regional mercury cycle.  相似文献   

НАБЛЮДЕНИЯ ПРИЛИВНЫХ ИЗМЕНЕНИЙ СИЛЫ　ТЯЖЕСТИ В Г.ЛАНЧЖОУ В 1959　ГОДУ     

Ю.С.доброхотов  Б.Д.Беликов  Ян　Хуэ-дзе  Сю　Бин-лин 《测绘学报》1960,(2)

3a пocлeдниe roды инcтpyмeнтaльныe Haблюдeния yпpyгиx пpиливов пoлyqчилишиpокoe paзвити. Обширныe Мaтepиaлы Taких Haблюдeний Имеют paзличнуюцeннocть. Она зaвисит Нe Тoлbко oт чyвcтвитeльнoстн пpибopов и пpoдoлжитeль-иoстн измeрeний, но Taкжe и от геогpaфичecкoгo pacпoлoжeния стaнций. Извecтиo,чтo искaжaющee влияниe окeaничeских приливов yмeньшaeтся c yдaлeниeм cтaн-~ций oт моpских бepeгав. Пoэтому ocoбeнный интepec пpeдcтaвляют мaтepиaлынаблюдeний нa стaнциях, pacпoлoжeнных внyтpи кoнтиннтoв.  相似文献   

柴达木盆地北缘大柴旦榴辉岩同位素年代学测定结果     

中法合作"阿尔金-祁连"项目组 《地质通报》1999,18(2)

柴北缘的榴辉岩由本项目组在１９９６年的野外工作中首次发现,对其岩石特征及地质意义进行了初步的探讨。最近,又对榴辉岩分别进行了锆石ＵＰｂ和ＡｒＡｒ同位素年代学测定。１榴辉岩样品的基本特征榴辉岩呈透镜状分布于达肯大坂群（Ｐｔ）的长英质片麻岩之中。用于...  相似文献