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2009 Vol. 20, No. 4

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U-Pb Zircon Ages, Geochemical and Sr-Nd-Hf Isotopic Compositions of Granitoids in Western Songpan-Garze Fold Belt: Petrogenesis and Implication for Tectonic Evolution
Cai Hongming (蔡宏明), Zhang Hongfei* (张宏飞), Xu Wangchun (徐旺春)
2009, 20(4) doi: 10.1007/s12583-009-0054-8
Granitoids are widespread in the Songpan-Garze (松潘-甘孜) fold belt, western China. These grani-toids provide insight into regional tectono-magmatic events, basement nature and tectonic evolution. However, previous studies mainly focused on the eastern Songpan-Garze fold belt. In this article, five granitoid intrusions from the western Songpan-Garze fold belt have been studied. These intrusions are composed of quartz-diorite and granodiorite. Using LA-ICP-MS zircon dating method, the obtained magma crystallization ages are 219±2 Ma for the quartz-diorite and 216±5 Ma for the granodiorite...
Correlations between Shortening Rate, Uplift Rate, and Inversion Rate in Central Inversion Zone of Xihu Depression, East China Sea Basin
杨风丽, 于海啸, 张青林, 李前裕
2009, 20(4) doi: 10.1007/s12583-009-0056-6
Late Miocene shortening rate, uplift rate, and inversion rate in the central inversion zone of the Xihu (西湖) depression, East China Sea basin, were independently determined from a large number of 2D reflection seismic data and methods. Shortening rate was estimated from the 2DMOVE balanced cross-section technology, uplift rate was calculated after absolute erosions were determined from seismic data during the uplifting time, and inversion rate was measured using the improved calculation method by Song (1997)...
Geological Conditions Favourable for High-Wax Oil Enrichment in Damintun Depression, Bohai Bay Basin
Zhu Fangbing* (朱芳冰)
2009, 20(4) doi: 10.1007/s12583-009-0066-4
The Damintun (大民屯) depression, a small (about 800 km2 in area) subunit in the Bohai (渤海) Bay basin, hosts nearly 2?108 t of high-wax oils with wax contents up to 60%. The high-wax oils have high consolidation temperatures and viscosities. The high-wax oils were generated from the fourth member of the Shahejie Formation (Es4), which is also important source rocks for oils in other subunits of the Bohai Bay basin. Yet high-wax oils have not been found in significant volumes elsewhere in the Bohai Bay basin...
Preferential Petroleum Migration Pathways in Eastern Pearl River Mouth Basin,Offshore South China Sea
于建宁, 邹华耀, 龚再升
2009, 20(4) doi: 10.1007/s12583-009-0062-8
Secondary petroleum migration in the eastern Pearl River Mouth basin was modeled using the three-dimensional PATHWAYSTM model, which assumes that the positions of petroleum migration pathways are controlled by the morphology of the sealing surfaces. The modeling results have accurately predicted the petroleum occurrences. Most commercial petroleum accumulations are along the predicted preferential petroleum migration pathways (PPMP), and most large fields (petroleum re-serves greater than 1×108 t) have more than one preferential petroleum migration pathways to convey petroleum to the traps...
Depositional Characteristics of Lake-Floor Fan of Cretaceous Lower Yaojia Formation in Western Part of Central Depression Region, Songliao Basin
辛仁臣, 李桂范, 冯志强, 梁江平, 林畅松
2009, 20(4) doi: 10.1007/s12583-009-0065-5
Based on the integrated subsurface data, including those of over 600 m drilled cores, more than 30 drilled wells and 600 km2 three-dimensional (3D) seismic-reflection data of the study area, the characteristics of the lake-floor fan of lower Yaojia (姚家) Formation have been clarified. An evident lacustrine slope break and a steep slope belt developed in the west of Songliao (松辽) basin during depositional period of Qingshankou (青山口)-Yaojia formations (K2). The slope gradient was about 15 m/km. During the depositional period of lower Yaojia Formation, the lake shrank and the shore line of the western Songliao basin shifted to the lacustrine slope-break...
Cenozoic Subsidence Features of Beitang Sag and Relationship with Tectonic Evolution
张婷婷, 王华, 岳勇, 黄传炎, 张立伟
2009, 20(4) doi: 10.1007/s12583-009-0061-9
Based on the application of the EBM basin modeling software and 2-D seismic profiles, the Paleogene and Neogene subsidence histories of the Beitang (北塘) sag are simulated with the backstripping technique, and the relationship between subsidence character and tectonic revolution is discussed. Moreover, the result of the basin modeling reveals that the subsidence history of the Beitang sag has the characteristics of several geological periods, and these succeeding periods have shown certain inheritance and difference characteristics...
Paleozoic Structural Deformation of Bachu Uplift, Tarim Basin of Northwest China: Implications for Plate Drifting
何光玉, 何治亮, 张洪安, 林璐, 陈强路, 钱一雄, 顾忆, 竺知新, 竺国强
2009, 20(4) doi: 10.1007/s12583-009-0059-3
Based on high-resolution 2D seismic profiles, the Paleozoic structural deformation characteristics of Bachu (巴楚) uplift of northwestern Tarim basin, NW China, are exhibited in this article. The deformation happened during three main geological periods: the end of Middle–Late Ordovician (O2–3), the end of Early–Middle Devonian (D1–2), and the end of Late Permian (P2). In the Bachu uplift, there developed a series of NW-trending thrust faults and imbricate structures due to the effect of the NW-SE compression stress towards the end of Middle–Late Ordovician (O2–3) (middle Caledonian movement), and there developed some NNE-trending thrust faults and fault blocks under the control of the NEE-SWW compression stress at the end of Early–Middle Devonian (D1–2) (early Hercynian movement)...
Distribution and Ecological Risk Evaluation of Organochlorine Pesticides in Sediments from Xinghua Bay, China
王英辉, 祁士华, 邢新丽, 龚香宜, 杨军华, 许美辉
2009, 20(4) doi: 10.1007/s12583-009-0060-x
The concentrations of organochlorine pesticides (OCPs) in sediments from Xinghua (兴化) Bay, Fujian (福建) Province, China, were determined. The OCP concentrations ranged from 2.48 to 313.88 ng/g, with a more serious contamination in the upper sediment. But the OCP concentration in the upper layer was less than that in the lower sediment at the exit of the bay due to the influence of the Coriolis force. At the joint of the internal and external bays, OCPs accumulated abundantly because of freshwater and seawater mingling...
U-Pb Zircon Age, Geochemical and Sr-Nd-Hf(Table)
刘荣, 张本仁, 张宏飞, 袁洪林
2009, 20(4)
U-Pb Zircon Ages, Geochemical and Sr-Nd-Hf Isotopic Compositions of Granitoids in Western Songpan-Garze Fold Belt: Petrogenesis and Implication for Tectonic Evolution(Table)
Cai Hongming (蔡宏明), Zhang Hongfei* (张宏飞), Xu Wangchun (徐旺春)
2009, 20(4)
Meso- and Micro-structures of Foliated Eclogites in Dabie-Sulu UHP Belt and Implications for the Earliest Stages of Exhumation of UHP Metamorphic Rocks: An Example from Taohang, Southeastern Shand
索书田, 钟增球, 周汉文, 游振东, 张利
2009, 20(4) doi: 10.1007/s12583-009-0057-5
The sub-vertical meso- and micro-structures and fabrics developed in coesite-bearing foliated eclogites in the Taohang (桃行) area, southeastern Shandong (山东), China. The diagnostic structures and fabrics, including penetrative foliation or mylonitic foliation containing mineral and stretching lineations, as well as sheath-like folds, appear to be the development of anastomosing UHP eclogite-facies shear belt arrays hosting massive eclogites...
U-Pb Zircon Age, Geochemical and Sr-Nd-Hf Isotopic Compositions of Neoproterozoic Granitoids in Northwestern Margin of Yangtze Block (South China): Implications for Neoproterozoic Tectonic Evolu
刘荣, 张本仁, 张宏飞, 袁洪林
2009, 20(4) doi: 10.1007/s12583-009-0058-4
The widespread Neoproterozoic magmatism along the Yangtze block carries critical information for understanding the Neoproterozoic evolution of the Yangtze block. In the northwestern margin of the Yangtze block, the Hannan (汉南) intrusive complex includes the Wudumen (五堵门), Erliba (二里坝) and Zushidian (祖师殿) granitoids. Using LA-ICP-MS U-Pb zircon dating method, the Wudumen and Erliba granitoids yielded magma crystallization ages of 785±4 and 778±3 Ma, respectively...