Age constraints on faulting and fault reactivation: a multi-chronological approach   总被引：2，自引：0，他引：2  

Wolfgang Siebel  Horst P. Hann  Martin Danišík  Cosmas K. Shang  Christoph Berthold  Johann Rohrmüller  Klaus Wemmer  Noreen J. Evans 《International Journal of Earth Sciences》2010,99(6):1187-1197

Movement within the Earth’s upper crust is commonly accommodated by faults or shear zones, ranging in scale from micro-displacements to regional tectonic lineaments. Since faults are active on different time scales and can be repeatedly reactivated, their displacement chronology is difficult to reconstruct. This study represents a multi-geochronological approach to unravel the evolution of an intracontinental fault zone locality along the Danube Fault, central Europe. At the investigated fault locality, ancient motion has produced a cataclastic deformation zone in which the cataclastic material was subjected to hydrothermal alteration and K-feldspar was almost completely replaced by illite and other phyllosilicates. Five different geochronological techniques (zircon Pb-evaporation, K–Ar and Rb–Sr illite, apatite fission track and fluorite (U-Th)/He) have been applied to explore the temporal fault activity. The upper time limit for initiation of faulting is constrained by the crystallization age of the primary rock type (known as “Kristallgranit”) at 325 ± 7 Ma, whereas the K–Ar and Rb–Sr ages of two illite fractions <2 μm (266–255 Ma) are interpreted to date fluid infiltration events during the final stage of the cataclastic deformation period. During this time, the “Kristallgranit” was already at or near the Earth’s surface as indicated by the sedimentary record and thermal modelling results of apatite fission track data. (U–Th)/He thermochronology of two single fluorite grains from a fluorite–quartz vein within the fault zone yield Cretaceous ages that clearly postdate their Late-Variscan mineralization age. We propose that later reactivation of the fault caused loss of helium in the fluorites. This assertion is supported by geological evidence, i.e. offsets of Jurassic and Cretaceous sediments along the fault and apatite fission track thermal modelling results are consistent with the prevalence of elevated temperatures (50–80°C) in the fault zone during the Cretaceous.  相似文献   

东营市国土资源局东营分局整治规范农村宅基地     

商少华  王可文 《山东国土资源》2009,25(12):61-62

2008年以来,东营区国土资源分局党组在认真分析当前农村政策和土地管理形式的基础上,将村庄整理复垦、“空心村”整治和宅基地管理列入工作重心,及时组织了全区农村“空心村”调查和宅基地管理的调研,建立健全了农村宅基地管理目标机制,并将其作为镇、街道综合考核的重要内容。  相似文献   

The Global Stratotype Section and Point （GSSP） for the boundary between the Capitanian and Wuchiapingian Stage （Permian）   总被引：3，自引：0，他引：3  

Yugan Jin Shuzhong Shen Charles M. Henderson Xiangdong Wang Wei Wang Yue Wang Changqun Cao Qinghua Shang 《《幕》》2006,29(4):253-262

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Analysis of the dynamic mechanisms of upwelling in deep ocean water caused by typhoons     

Lei  Famei  Dai  Hao  Shang  Shaoping  He  Zhigang  Yang  Shuai 《Ocean Dynamics》2023,73(8):517-529

Ocean Dynamics - A typhoon (hurricane) is a very strong local disturbance that can affect ocean water as deep as 1000&nbsp;m. According to observations and numerical simulations, the decrease...  相似文献