We report here lattice preferred orientations （LPOs） and seismic properties of eclogites from the Sulu （苏鲁） UHP terrane. Our results show strong fabrics in omphacite and amphibole, and approximately random fabrics in garnet with or without strong shape preferred orientations （SPOs）. Dislocation creep is likely to be responsible for the observed omphacite fabrics that vary with geometry and orientation of finite strain ellipsoid. Weak garnet LPOs suggest that garnet did not accommodate plastic strain or was not deformed by dislocation creep with a dominant slip system. The calculated seismic properties of eclogites and their component minerals show a strong correlation with their LPOs. Seismic anisotropies are mostly induced by omphacite component in fresh eclogites and by amphibole component in retrograded eclogites, respectively. Retrogression of omphaeite to amphibole and quartz will increase seismic anisotropies but decreases seismic velocities of eclogite. Garnet component increases the seismic velocities but decreases seismic anisotropies of eciogite. Comparison of the calculated and the measured seismic properties of eclogites suggests that both methods resolve comparable results with some discrepancies. Compositional layering can play a very important role in determining the seismic properties of eclogites in addition to LPO.
The fluvio-lacustrine sequence of the Shanwang Basin,eastern China,preserves a rich and important terrestrial ...
Huaiyu He~(a,*),Chenglong Deng~b,Yongxin Pan~a,Tao Deng~c,Zhaohua Luo~d,Jimin Sunb,Rixiang Zhu~b a Key Laboratory of the Earth’s Deep Interior,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China b State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China c Institute of Vertebrate Paleontology and Paleoanthropology,Chinese Academy of Sciences,Beijing 100044,China d China University of Geosciences,Beijing 100083,China
The Luoping Biota consists of abundant and well-preserved marine fishes, reptiles, invertebrates, and plants. It occurs in the Middle Triassic Guanling Formation in Daaozi Village of Luoping County, Yun-nan Province, China. Based on conodonts, the Luoping Biota is determined to lie within the Nicoraella kockeli Zone, which is assigned to the Pelsonian substage of the Anisian.
