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| 1 | Mesozoic-Cenozoic Multi-Stage Intraplate Deformation Events in the Langshan Region and their Tectonic Implications显示文摘In the Langshan region, northwestern China, marked multi-stage intraplate deformation events have occurred since the Mesozoic, including(1) northeast-striking ductile left-lateral strike slip during the Middle-Late Triassic, which is closely related to the collision between the North China and the Yangtze plates;(2) top-to-the-southeast thrust with northwest-southeast trending maximum compression during the Late Jurassic;(3) nearly eastward detachment during the Early Cretaceous;(4) top-to-the-northwest thrust with northwest-southeast trending maximum compression during the Late Cretaceous and Early Cenozoic;(5) northeast-striking brittle left-lateral strike slip with nearly north-south trending maximum compression; and(6) northwest-southeast extension during the Middle-Late Cenozoic. All these deformation events belong to the intraplate deformation across the entire Central Asian region and respond to the tectonic events along the plate boundaries or deep tectonics. The structures developed in early events in the crust were the most important factors controlling the later deformation styles, and few new structures have later developed. Based on previous research and our results, the paleostress inversion in the Langshan region shows that the Mesozoic intraplate deformations in the study region mainly resulted from the tectonic events from the Paleo-Pacific region and have no or a weak relation to the Tethys region. During the Late Jurassic, the maximum compression from the Mongolia-Okhotsk region cannot be excluded. The Langshan region is the bridge between southern Mongolia and the western Ordos tectonic belt and is thus important to understand the nature and relationship between both regions. | ZHANG Jin LI Jinyi LI Yanfeng QI Wenhua ZHANG Yiping | 2014 | Acta Geologica Sinica(English Edition)2014，88，1： | 18 |
| 2 | Multistage Deformation in the Northeastern Segment of the Jiangshao Fault (Suture) Belt: Constraints for the Relationship between the Yangtze Plate and the Cathaysia Old Land显示文摘Multistage deformation events have occurred in the northeastern Jiangshao Fault (Suture) Belt. The earliest two are ductile deformation events. The first is the ca. 820 Ma top-to-the-northwest ductile thrusting, which directly resulted from the collision between the Cathaysia Old Land and the Chencai Arc (?) during the Late Neoproterozoic, and the Jiangnan Orogenic Belt that formed as the ocean closed between the Yangtze Plate and the jointed Cathaysia Old Land and the Chencai Arc due to continuous compression. The second is the ductile left-lateral strike-slipping that occurred in the latest Early Paleozoic. Since the Jinning period, all deformation events represent the reactivation or inversion of intraplate structures due to the collisions between the North China and Yangtze plates during the Triassic and between the Philippine Sea and Eurasian plates during the Cenozoic. In the Triassic, brittle right-lateral strike-slipping and subsequent top-to-the south thrusting occurred along the whole northeastern Jiangshao Fault Zone because of the collision between the North China and Yangtze plates. In the Late Mesozoic, regional extension took place across southeastern China. In the Cenozoic, the collision between the Philippine Sea and Eurasian plates resulted in brittle thrusts along the whole Jiangnan Old land in the Miocene. The Jiangshao Fault Belt is a weak zone in the crust with long history, and its reactivation is one of important characteristics of the deformation in South China; however, late-stage deformation events did not occur beyond the Jiangnan Old Land and most of them are parallel to the strike of the Old Land, which is similar to the Cenozoic deformation in Central Asia. In addition, the Jiangnan old Land is not a collisional boundary between the Yangtze Plate and Cathaysia Old Land in the Triassic. | ZHANG Jin LI Jinyi XIAO Wenxia FENG Qianwen MA Zongjin | 2013 | Acta Geologica Sinica(English Edition)2013，87，4： | 7 |
| 3 | Fault-Growth Pattern of the South Margin Normal Fault of the Yuguang Basin in Northwest Beijing and its Influencing Factors显示文摘Based on high-resolution remote sensing image interpretation, digital elevation model 3-D analysis, field geologic field investigation, trenching engineering, and ground-penetrating radar, synthetic research on the evolution of the Yuguang Basin South Margin Fault (YBSMF) in northwest Beijing was carried out. We found that the propagation and growth of faults most often occurred often at two locations: the fault overlapping zone and the uneven or rough fault segment. Through detailed observation and analysis of all cropouts of faults along the YBSMF from zone a to zone i, we identified three major factors that dominate or affect fault propagation and growth. First, the irregularity of fault geometry determine the propagation and growth of the fault, and therefore, the faults always propagate and grow at such irregular fault segments. The fault finally cuts off and eliminates its irregularity, making the fault geometry and fault plane smoother than before, which contributes to the slipping movement of the half-graben block in the basin. Second, the scale of the irregularity of the fault geometry affects the result of fault propagation and growth, that is, the degree of the cutting off of fault irregularity. The degree of cutting off decreases as irregularity scale increases. Third, the maximum possible slip displacement of the fault segment influences the duration of fault propagation and growth. The duration at the central segments with a large slip displacement is longer than that at the end segments with a smaller slippage value. | WANG Lin TIAN Qinjian LI Dewen ZHANG Xiaoliang | 2013 | Acta Geologica Sinica(English Edition)2013，87，3： | 6 |
| 4 | Impact of Conjugated Shear Joint of“X”Type on Macroscopic Karstification on the Basis of the Analysis of Google Earth Images显示文摘As viewed from space remote-sensing images(e.g.Google Earth images) of South Guizhou and North Guangxi,the authors found that macroscopic karst landscape on the Earth's surface is strongly controlled by the Conjugated shear joint of 'X' type.Joints of this kind constitute a huge infiltration network and act as channel-ways for the permeation of meteoric waters from the surface,thus,leading to the dissolution of carbonate rocks nearby.As a result,the karst landscape is formed,which is dominated by linear karst valleys.An 'X' karst valley network structure appears in the area where horizontal strata are distributed,and a feather-like network structure appears in the area where vertical strata are distributed,respectively.When the water permeates downwards to the underground-water level,it will flow horizontally along the strike of 'X' joints toward the local base level of erosion to form an 'X' network system of underground conduits in the area where horizontal strata are distributed,but it is relatively complex,because of the joining of other joints.This is the first time we have made use of Google Earth images to study the karst environment.Therefore,it has been successful in research on the Earth's geomorphology,which could only rely on aerial photos and satellite photos in the past.Google Earth images provide low-cost and applicable imaging materials for the study of Earth's geomorphology and karst rocky desertification and its control. | YANG Ruidong SHENG Xueyong WEI Xiao WEN Xuefeng | 2012 | Acta Geologica Sinica(English Edition)2012，86，2： | 1 |
| 5 | 地质学报,2012年,第86卷,总目次显示文摘 | | 2012 | 地质学报2012，86，12： | 0 |
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