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The age of formation of the Lapstone Monocline has been long considered to be late Pliocene/early Pleistocene (the Kosciusko Uplift) but it is now generally thought to be much older. Palaeomagnetic data from haematite‐rich beds within the Hawkesbury Sandstone on and about the monocline indicate that it formed before the oldest haematite was introduced to these beds. The age of this oldest haematite is 15 ± 7 Ma. On the basis of these data, the age of the monocline is unlikely to be less than 8 Ma, probably exceeds 15 Ma, and could be older than 22 Ma. 相似文献
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Holocene Yellow Silt Layers and the Paleoclimate Event of 8200 a B.P. in Lop Nur, Xinjiang, NW China
LIU Chenglin WANG Mili JIAO Pengcheng LI Shude CHEN YongzhiCollege of Environmental Sciences Peking University Yiheyuan Ro Haidian District Beijing Institute of Mineral Resources Chinese Academy of Geological Sciences Baiwanzhuang Ro Beijing 《《地质学报》英文版》2003,77(4):514-518
Many yellow silt layers have been identified in the Holocene sediments in the last lake of Lop Nur (playa), Xinjiang, northwestern China. Statistics of drill-hole cores have revealed more than one hundred layers, which exhibit regularity in time sequence. Study has further verified that these yellow silt layers were deposited through eolian processes. The time-frequency distribution diagram shows an obvious peak occurring at about 8200 a B.P., which is consistent with the dry, windy and cold climate event occurring at 8200 a in other places around the world. Therefore, this event is regarded as a response to the global climate change. 相似文献
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Zeng Fanwei 《Environmental Earth Sciences》2014,71(3):1453-1463
In recent years, geoparks (a geoheritage effort to protect geological features) have been vigorously promoted in China and abroad. The evaluation of a geopark is important for geopark development. However, current evaluation methods focus on geoheritage and their values, and often ignore residents’ situations, even though community participation is essential to the sustainable development of geoparks. In this paper, the Mt. Huaying Grand Canyon Geological Park was selected as a study area to evaluate resident’s perceptions of the park. Perception impact factors were selected from the perspective of the park residents. Quantitative evaluation models, based on data from questionnaires, were created using the hierarchy process model and expert evaluation method. The results showed that the following factors influenced residents’ perceptions, listed from the most significant to the least: residents’ understanding of geoheritage, participation level in commercial activities, participation level in planning decisions, satisfaction level regarding benefit distribution and level of participation willingness. It was found that residents’ level of understanding of geoheritage and their participation level in planning decisions were the main reasons for poorer perceptions of geoheritage. The keys to improving residents’ perceptions of geoheritage are to change the management system, implement people-centered policies and to establish a government-led management mode that encourages community participation and involves private business contracts. 相似文献
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《地质学报》1932,11(2):101-105
In opening the meeting, the chairman made the following address: "It is my agreable duty to announce and make the award of the Grabau Medal to two members of our Society, Drs. J. S. Lee and Davidson Black. "The Grabau Medal was founded in 1925 by Mr. C. Y. Wang. the then President of the Geological Society. It was so named in honor of Dr. Grabau 相似文献
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《International Geology Review》2012,54(9):1382-1387
This petrophysical model represents a very slow metamorphism, with its characteristically “pre-granitic” stages and facies, the kind that develops in deep geosynclinal downwarps and deep platformal syneclises, but not in intermontane downwarps or aulacogens. The rate of the subsidence, as in the model, indicates 6 to 7 km thicknesses of the 100°C metamorphic zones and much greater depths for the high-temperature metamorphism and actual smelting of the sediments, under certain conditions. — V .P Sokoloff. 相似文献
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