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| 1 | New Discovery of the Early Cretaceous Volcanic Rocks on the Barton Peninsula,King George Island,Antarctica and Its Geological Significance显示文摘Ages determined with the 40Ar/39Ar isotopic system affirms the Early Cretaceous volcanic activity in the Barton Peninsula, King George Island, Antarctica. Two specimens of basaltic andesite collected from the lowermost volcanic sequence of the peninsula were irradiated and analyzed in different experiments, yielding an identical age spectrum, and two magmatic thermal events of the Early Cretaceous (120.4±1.6 Ma, 119±1 Ma) and Early Tertiary (5 3.1±1.5 Ma, 52±1 Ma) are distinguished. The former is interpreted to represent the primary cooling age of basaltic andesite, whereas the latter is the thermal reset age caused by the intrusion of granitic pluton. These new ages clearly indicate that volcanism was active during the Early Cretaceous on the Barton Peninsula and that intensive hy-drothermal alteration and mineralization of Mesozoic volcanic rocks resulted from Tertiary magmatism. | ZHENG Xiangshen SANG Haiqing QIU Ji LIU Jiaqi LEE Jong Ik KIM Hyeoncheol | 2000 | Acta Geologica Sinica(English Edition)2000，74，2： | 2 |
| 2 | PALEOMAGNETISM OF THE LATE CRETACEOUS AND EARLY TERTIARY ROCKS FROM FILDES PENINSULA,WEST ANTARCTICA, AND ITS GEOTECTONIC SIGNIFICANCE显示文摘The paleomagnetis m of 109 oriented samples collected from drill cores through 5 rock units of Late Cretaceous and Early Tertiary on Fildes Peninsula were systematically studied. According to the study, the paleomagnetic pole position of this area is different from the position of Australia during the 55-45 Ma period. This means that when the break-up of the Gondwanaland at 55-45 Ma ago, Australia was separated from the Gondwanaland, drifting southward 20°-30°Lat. and rotating 70°-80°westward and then gradually arriving at recent position. The paleolatitudinal data indicate that it is not impossible that the area studied was covered with land glacier at that time. The apparent polar wander path of Antarctica through the geological time are also roughly worked out. | Liu Chun, Zhu Rixiang, Zheng Xiangshen, Liu Xiaohan Jin Zengxin, Feng YuInstitute of Geology, Academia Sinica,Beijing, 100029 Institute of Geophysics, Academia,Sinica,Beijing, 100101 | 1992 | Chinese Journal of Polar Science1992，3，1： | 0 |
| 3 | SYSTEMATIC COVARIATION OF SR, BA, CA ELEMENTS IN CENOZOIC VOLCANIC ROCKS ON THE FILDES PENINSULA, WEST ANTARCTICA, AND ITS RELATION TO PEIROGENESIS显示文摘Cenozoic volcanic rocks in the Fildes Peninsula are composed of High-Al basalt, basaltlc andesite, andesite, and dacite belonging to a calc-alkaline volcanic series with low-K and high-A1 characteristics. Using a new indicator, the Sr/Ca-Ba/Ca, systematics proposed by Onuma (1980, 1981) and Sr, Ba, Ca concentrations in volcanic lavas and subvolcanic rocks, the authors find that the high-A1 basaltic volcanic rocks either in volcanic strata or in subvolcanic intrusives were formed from a primary magma, in different stages through the fractional crystallization of clinopyro-xene(Cpx)and plagioclase (P1) in the process of magmatic evolution, resulting in the formation of basaltic-andesitic, andesitic and dacitic rocks. | Zheng Xiangshen and Liu XiaohanLaboratory of Lithosphere Tectonic Evolution,Institute of Geology, Academia Sinica,P.O. Box 634, Beijing 100029 | 1991 | Chinese Journal of Polar Science1991，2，1： | 0 |
| 4 | GEOLGY OF FILDES PENINSULA,KING GEORGE ISLAND,WEST ANTARCTICA——A Study on the Stratigraphy and Volcanism显示文摘On the basis of the geological mapping, isotopic choronoogcal and petrological evidences, the aumors suggested that the early Tertiary volcanic strata in the Fildes Peninsula could be divided into two formations and four members. The erupted centers in the peninsula were gradualy migrating from the western coast to the eastern and the subvolcanic intrusives were regularly distributed along a series of NWW-SEE trending faults. All of these were basically formed in two stages of volcanic activities from Paleocene to Eocene. | Zheng Xiangshen and Liu XiaohanLaboratary of Lithosphere Tectonic Evolution Institute of Geology, Academia Sinica, P.O. Box 634, Beijing 100029 | 1990 | Chinese Journal of Polar Science1990，1，1： | 0 |
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