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Seismic profiles across the middle Tan-Lu fault zone in Laizhou Bay,Bohai Sea,eastern China
Institution:1. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao City 266071, China;2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;3. Petroleum University of China (Huadong), Qingdao 266555, China;4. Geophysical Research Institute, Shengli Oil Field, Dongying 257022, China;1. Key-Laboratory for Oil Shale and Coexisting Minerals Mineralization & Exploration and Exploitation, Jilin University, Changchun 130061, China;2. Qingdao Institute of Marine Geology, Qingdao 266071, China;1. MLR Key Laboratory of Metallogeny and Mineral Assessment, Institute of Mineral Resources, CAGS, 26 Baiwanzhuang Road, Beijing 100037, China;2. Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China;3. Department of Geophysics, Stanford University, Stanford, CA 94305-2215, USA
Abstract:The stratigraphic architecture, structure and Cenozoic tectonic evolution of the Tan-Lu fault zone in Laizhou Bay, eastern China, are analyzed based on interpretations of 31 new 2D seismic lines across Laizhou Bay. Cenozoic strata in the study area are divided into two layers separated by a prominent and widespread unconformity. The upper sedimentary layer is made up of Neogene and Quaternary fluvial and marine sediments, while the lower layer consists of Paleogene lacustrine and fluvial facies. In terms of tectonics, the sediments beneath the unconformity can be divided into four main structural units: the west depression, central uplift, east depression and Ludong uplift. The two branches of the middle Tan-Lu fault zone differ in their geometry and offset: the east branch fault is a steeply dipping S-shaped strike-slip fault that cuts acoustic basement at depths greater than 8 km, whereas the west branch fault is a relatively shallow normal fault. The Tan-Lu fault zone is the key fault in the study area, having controlled its Cenozoic evolution. Based on balanced cross-sections constructed along transverse seismic line 99.8 and longitudinal seismic line 699.0, the Cenozoic evolution of the middle Tan-Lu fault zone is divided into three stages: Paleocene–Eocene transtension, Oligocene–Early Miocene transpression and Middle Miocene to present-day stable subsidence. The reasons for the contrasting tectonic features of the two branch faults and the timing of the change from transtension to transpression are discussed.
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