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辽北法库构造岩系的^(40)Ar/^(39)Ar年代学研究及地质意义 被引量:7
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作者 张晓晖 王辉 李铁胜 《中国科学(D辑)》 CSCD 北大核心 2004年第6期504-513,共10页
由于缺乏可靠的同位素年代学资料, 辽北法库地区的变质岩系一直被看作地台基底型建造, 近期研究确认它们属于原岩为深成侵入体和火山-沉积岩系、 后经韧性剪切作用而形成的变形变质岩系. 它们与遭受同期动力变质作用影响的同构造侵入岩... 由于缺乏可靠的同位素年代学资料, 辽北法库地区的变质岩系一直被看作地台基底型建造, 近期研究确认它们属于原岩为深成侵入体和火山-沉积岩系、 后经韧性剪切作用而形成的变形变质岩系. 它们与遭受同期动力变质作用影响的同构造侵入岩一道构成了规模巨大的法库构造岩系. 报道了该套构造岩系中花岗质糜棱岩的40Ar/39Ar同位素测年结果: FK53角闪石的256 Ma坪年龄和FK51-1黑云母的262 Ma高温坪年龄记录了古生代末洋壳向陆内俯冲或多陆块碰撞背景下发育的花岗岩抬升至浅部地壳层次的冷却年龄, FK51-1黑云母的231 Ma主坪年龄和FK51-2钾长石的227 Ma可能代表了绿片岩相条件下花岗质岩石经历韧性变形作用即法库构造岩系的形成年龄. FK51-2钾长石的年龄梯度197~220 Ma记录了构造岩系形成之后比较平稳的抬升冷却历程, 而其180 Ma坪年龄则可能与太平洋板块向华北板块俯冲背景下的构造剥蚀事件有关. 同时报道了后期侵入花岗岩的锆石U-Pb和40Ar/39Ar同位素测年结果: FK54锆石的U-Pb年龄(159 Ma)代表了红土墙子超单元花岗岩的侵入年龄, 也界定了法库构造岩系的形成年龄上限, FK54钾长石的125 Ma坪年龄则可能记录了华北板块与西伯利亚板块最终碰撞背景下的构造剥蚀事件. 这些同位素年龄记录为重新认识法库断凸之内涵? 展开更多
关键词 辽北 构造岩系 锆石U-PB年龄 法库断凸 ^40AR/^39AR年代学 同位素年代学 花岗质
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基于块系构造的大规模地下爆炸不可逆位移计算方法 被引量:10
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作者 李杰 陈伟 +1 位作者 施存程 王明洋 《爆炸与冲击》 EI CAS CSCD 北大核心 2018年第6期1271-1277,共7页
岩体是复杂的等级构造地质体,本文中假设岩体构造符合Sadovsky院士块系构造等级学说,即岩体中存在稳定的不变量λ和μΔ,从而采用简化的分析模型研究构成岩体的岩块在爆炸地冲击扰动作用下的平动和转动,指出Kocharyan激活块体尺度计算... 岩体是复杂的等级构造地质体,本文中假设岩体构造符合Sadovsky院士块系构造等级学说,即岩体中存在稳定的不变量λ和μΔ,从而采用简化的分析模型研究构成岩体的岩块在爆炸地冲击扰动作用下的平动和转动,指出Kocharyan激活块体尺度计算式中忽略的条件,重新推导给出了大规模地下爆炸诱发远区局部不可逆位移计算公式。 展开更多
关键词 大规模地下爆炸 体块构造 等效平均动能 局部不可逆变形
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基于能量原理的大规模地下爆炸不可逆位移计算方法 被引量:8
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作者 王明洋 李杰 +1 位作者 邱艳宇 陈伟 《爆炸与冲击》 EI CAS CSCD 北大核心 2017年第4期685-691,共7页
岩体是复杂的等级构造地质体,在高地应力作用下,因摩擦和粘结作用,内部封存能量,可看作具有内部能量源和能量汇的介质。基于岩体块系构造,对岩体在扰动下的运动积分和等效动能进行分析,提出了在高地应力赋存环境中岩体受爆炸地震波扰动... 岩体是复杂的等级构造地质体,在高地应力作用下,因摩擦和粘结作用,内部封存能量,可看作具有内部能量源和能量汇的介质。基于岩体块系构造,对岩体在扰动下的运动积分和等效动能进行分析,提出了在高地应力赋存环境中岩体受爆炸地震波扰动下的等效地冲击能量因子,并给出了大规模地下爆炸诱发远区局部不可逆范围的计算公式。与G.G.Kocharyan等基于块体运动分析给出的计算公式比较表明,本文中提出的计算理论物理过程清晰,更具有适用性。 展开更多
关键词 大规模地下爆炸 体块构造 等效平均动能 局部不可逆变形
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Origin of C type adakite magmas in the NE Xing'an block, NE China and tectonic implication 被引量:6
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作者 Changzhou Deng Guangyi Sun +3 位作者 Deyou Sun Hu Huang Jianfeng Zhang Jun Gou 《Acta Geochimica》 EI CAS CSCD 2018年第2期281-294,共14页
In this paper, we report new whole-rock geochemical and zircon U-Pb data for monzogranites in the NE Xing'an block. These data constrained the petrogenesis of C type (high Sr/Y) adakitic rocks and showed the spatia... In this paper, we report new whole-rock geochemical and zircon U-Pb data for monzogranites in the NE Xing'an block. These data constrained the petrogenesis of C type (high Sr/Y) adakitic rocks and showed the spatial extent of the influence of the Mongol-Okhostsk ocean tectonic regime and the collision between the Jiamusi Massif and Songliao Terrane. New zircon laser-ablation inductivity coupled plasma mass spectrometry (LA-ICP-MS) U-Pb data indicated that the monzogranites in the studied area were emplaced in the Early Jurassic (~ 180 Ma). These rocks were characterized by unusally high SiO2 (≥67.49), and Sr (461-759 ppm), but strikingly low Y (4.63-8.06 ppm) and HREE (∑HREE = 3.83-6.49 ppm, Yb = 0.5-0.77 ppm) contents, with therefore high Sr/Y (67.2-119) and (La/Yb)N (29.7-41.5) ratios, showing the geochemical characteristics of C type adakitic granite. The data displayed negligible Eu anomalies (Eu/Eu^* =0.77-1.08), LREE-enriched and pronounced negative Nb and Ta anomalies. The C-type adakites in the studied area were most likely derived from the partial melting of a thickened lower continental curst. The magma source is most likely dominated by amphibolites and garnet amphibolites. In combination with previously-reported data from igneous rocks from the Mesozoic in NE China, we conclude that the Xing' an block was influenced by the Mongol-Okhotsk subduction tectonic system, and experiences compressive settings from the amalgamation of the Jiamusi block in the east of the CAOB. 展开更多
关键词 C type adakite Geochemistry U-Pb age Thickened LCC NE Xing' an block
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Evolution of hydrocarbon generation of Jurassic source rock of the Lenke-1 well in Lenghu tectonic belt of Qaidam basin,China
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作者 ZHU Yan-ming ZHANG Ming +4 位作者 JIANG Bo PEN De-hua YI Cheng-min ZENG Chun-lin WU Ying 《Mining Science and Technology》 EI CAS 2009年第2期235-240,共6页
The Lenghu tectonic belt is located at or near the northern margin in the Qaidam Basin,which is an intracontinental composite basin evolved during the Mesozoic and Cenozoic epochs.The Lower Jurassic is considered a go... The Lenghu tectonic belt is located at or near the northern margin in the Qaidam Basin,which is an intracontinental composite basin evolved during the Mesozoic and Cenozoic epochs.The Lower Jurassic is considered a good source rock with a wide distribution.Since the deposit of the Lower Jurassic hydrocarbon source rock,the basin has undergone many tectonic events of subsidence and uplift.The source rocks in the Lengke-1 well,have experienced a complicated tectonic-burial history during which different hydrocarbon generation(HG) evolutions have taken place.We have investigated the history of burying,heating and hydrocarbon generation of the Lower Jurassic source rocks,not just on the basis of tectonic disturbance and deep burial,but also from new studies in fluid inclusion measurements and the application of numerical simulation with EASY%Ro.Our study reveals the evolution process,tectonic episodes and the strength of the HG of the Jurassic source rock.We conclude that twice HG processes have taken place since the Lower Jurassic formation and infer from that the important conclusion that more HG of the Lower Jurassic source rock took place during the Eocene-Miocene epochs.Finally,we discuss the oil and gas tarp formation and destruction in the Lenghu tectonic belt and point out that more attention should be paid to the thrust faults,which formed during the late Himalayan epoch. 展开更多
关键词 Lower Jurassic source rocks hydrocarbon generation EASY%Ro numerical simulation Lenghu tectonic belt
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Geochemistry and tectonic significance of volcanic rocks from Qushenla Formation in Gerze area of northern Tibetan Plateau
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作者 ZHANG Rui CHI Xiaoguo +6 位作者 LIU Jianfeng ZHAO Yuandong SUN Wei PAN Shiyu QUAN Jingyu FAN Lefu WANG Limin 《Global Geology》 2015年第1期16-25,共10页
By using petrological,isotope chronological,and geochemical methods,the authors studied the volcanic rocks in the studied area,mainly including dacites and trachytes. The results show that they formed during the late ... By using petrological,isotope chronological,and geochemical methods,the authors studied the volcanic rocks in the studied area,mainly including dacites and trachytes. The results show that they formed during the late Early Cretaceous. Geochemically,the volcanic rocks are relatively enriched in large-ion lithophile elements( Rb,K,and Th) and depleted in high field strength elements( Nb,Ta,and Ti),and rich in light rare earth elements,and depleted in heavy rare earth elements. The fact indicates that the main body of the volcanic rocks in the Qushenla Formation was derived from the partial melting of lower crust. The lithological assemblages are characterized by continental high-K calc-alkaline and shoshonitic series,suggesting that the southward-subducting oceanic slab in southern Bangong Lake had break off and that the Bangong Lake-Nujiang Ocean had closed before 107 Ma. The main dynamic mechanisms for the genesis of this set of intermediate-acidic volcanic rocks were upwelling of the asthenosphere and partial melting of the lower crust caused by slab break-off. 展开更多
关键词 Tibetan Plateau Gaize volcanic rock GEOCHEMISTRY tectonic significance Qushenla Formation
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