贵州西北部基性侵入岩锆石U-Pb年代学、岩石地球化学特征 及其与铅锌成矿关系初探   总被引：1，自引：0，他引：1  

齐有强  胡瑞忠  张海  任光明  武丽艳  朱经经  王新松  孟昌忠  金翔霖 《地质学报》2016,90(5):933-949

贵州西北部发育多处基性侵入岩,总体规模较小(约0.25 Km2),多沿深大断裂侵位,出露于铅锌矿点外围,本文对猫猫厂、凉山两处矿点附近的儿马冲和白岩庆两地小型基性侵入岩进行了重点研究。侵入岩主要岩性为细粒辉长岩,造岩矿物主要为拉长石、普通辉石。SiO2范围为49.60-51.09 wt%,MgO从3.88-4.27 wt %,TiO2为3.69-3.85 wt %。LA-ICP-MS锆石U-Pb定年结果为268.3±7.4 Ma,显示岩浆侵位于二叠纪。基性侵入岩的微量元素蛛网图呈OIB型特征,富集大离子亲石元素（LILE）、轻稀土元素（LREE）,亏损重稀土元素（HFEE）,相对亏损高场强元素（Nb,Ta）,有Sr、Y亏损,Pb富集。(87Sr/86Sr)i范围0.706749～0.707069,(143Nd/144Nd)i范围0.512313～0.512363,εNd(t)范围0.2～1.2;源区熔融深度处于石榴石橄榄岩相深度,可能经历了1-3 %的部分熔融,处于亏损石榴石二辉橄榄岩相向原始石榴石二辉橄榄岩相的过渡区。成岩过程中发生了单斜辉石、斜长石等矿物分离结晶,受到了有限的地壳混染作用,未经历明显的AFC过程。地壳物质在地幔源区中的加入可能是造成地幔富集的主要原因。侵入岩与成矿作用之间的关系,主要通过两方面所表现。一方面是二者间构造活动上的耦合性。另一方面是基性岩在成矿过程中可能发挥了重要的化学屏障层作用。  相似文献   

准噶尔盆地油气源、油气分布与油气系统   总被引：1，自引：0，他引：1  

陈建平  王绪龙  邓春萍  梁狄刚  张越迁  赵喆  倪云燕  支东明  杨海波  王屿涛 《地质学报》2016,90(3):421-450

准噶尔盆地是中国西部典型的多旋回叠合盆地,发育有石炭系、二叠系、三叠系、侏罗系、白垩系和古近系6套烃源岩,同时存在6大类原油和3大类天然气,广泛分布于盆地不同地区。西北缘原油总体相似,碳同位素组成轻(δ~(13)C-29‰),胡萝卜烷、类异戊二烯烷烃、三环萜烷、伽马蜡烷丰富,甾烷以C_(28)、C_(29)为主,基本没有重排甾烷,为第二类原油,来源于二叠系湖相烃源岩。腹部绝大多数原油与西北缘原油相似,但胡萝卜烷、类异戊二烯烷烃、伽马蜡烷等有差异,来源于不同凹陷的二叠系湖相烃源岩;少量原油碳同位素组成重(δ~(13)C-28‰~-26‰),Pr/Ph大于2.5,三环萜烷以C_(19)、C_(20)为主,藿烷丰富而伽马蜡烷极低,以C_(29)规则甾烷及重排甾烷为主,为第四类原油,来源于侏罗系煤系烃源岩。东部存在5种类型原油,第一类原油碳同位素组成特别重(δ~(13)C-26‰),来源于石炭系烃源岩;第二类原油与腹部地区绝大多数原油十分相似,来源于二叠系湖相烃源岩;第三类原油碳同位索组成轻,重排甾烷、Ts、C_(29)Ts及C_(30)重排藿烷异常丰富,来源于中上三叠统湖相烃源岩;第四类原油源于侏罗系煤系烃源岩;混合类原油为二叠系、三叠系、侏罗系原油的混合,各自贡献平均分别为20%、15%和65%。南缘存在4类典型原油,为第二、第四、第五和第六类原油,其中第二、第四类分别源于二叠系和侏罗系;第五类原油碳同位素组成轻(δ~(13)C-29‰)、Pr/Ph1.0、伽马蜡烷丰富且有两个异构体、Ts、C_(29)Ts、C_(30)重排藿烷、C_(27)~C_(29)异胆甾烷及C_(30)甲基甾烷丰富,来源于白垩系湖相烃源岩;第六类原油主要为中低成熟原油,碳同位素组成δ~(13)C~28‰~-26‰,C_(27)、C_(28)、C_(29)甾烷呈"V"型分布,甲藻甾烷异常丰富,来源于古近系湖相烃源岩。准噶尔盆地天然气有油型气、混合气和煤型气,前两类主要来源于二叠系湖相烃源岩和石炭系海相烃源岩,煤型气主要来源于石炭系和侏罗系煤系烃源岩。不同类型油气分布与不同时代烃源灶具有良好对应关系:石炭系油气主要分布于陆东-五彩湾;二叠系油气主要分布于西北缘、腹部与东部;三叠系原油仅分布于东部;侏罗系原油主要分布于东部与南部;白垩系原油仅分布于南缘中部;古近系原油仅分布于南缘西部。按照盆地构造特征及不同时代烃源灶与油气关系,将准噶尔盆地划分为西部、中部、东部、南部及乌伦古5个油气系统及15个子油气系统。  相似文献   

湖北南漳-远安动物群及其生物复苏意义     

陈粲  陈孝红  程龙  阎春波 《地质学报》2016,90(3):409-420

湖北西部远安县鹰子山、洋坪至南漳县巡检、古井一带下三叠统嘉陵江组第三段上部厚约30 m的纹层状灰岩中产有湖北鳄类、鳍龙类、鱼龙类等多门类海生爬行动物化石,形成了一个以富产湖北鳄类化石为特点,湖北鳄类、鳍龙类、鱼龙类等多门类海生爬行动物共同繁盛的南漳-远安动物群。由于该动物群中海生爬行动物的生物类型和化石属、种的分异度已近接近中三叠世生物复苏之后所形成的以海生爬行动物繁盛为特征的罗平-盘县生物群,指示海生爬行动物的首次辐射发生在早三叠世晚期,并由此形成了以食物链顶端的海生爬行动物为主而重建的中生代全新的海洋生态系统。  相似文献   

Assessing Performance of Tomo-SAR and Backscattering Coefficient for Hemi-Boreal Forest Aboveground Biomass Estimation     

Wenmei Li  Erxue Chen  Zengyuan Li  Wangfei Zhang  Chang Jiang 《Journal of the Indian Society of Remote Sensing》2016,44(1):41-48

Tomo-SAR technique has been used for hemi-boreal forest height and further forest biomass estimation through allometric equation. Backscattering coefficient especially in longer wavelength (L- or P-band) is thought as a useful parameter for hemi-boreal forest biomass retrieval. The aim of this paper is to assess the performance of vertical backscattering power and backscattering coefficient for hemi-boreal forest aboveground biomass (AGB) estimation with airborne P-band data. The test site locates in southern Sweden called Remningstorp test site, and the in-situ forest AGB ranges from 14 t/ha to 245 t/ha at stand level. Multi-baseline P-band Pol-InSAR data in repeat-path mode collected during March and May in 2007 at Remningstorp test site was used. We found that the correlation coefficient (R) between backscattering coefficient of P-band HH polarization and the in-situ forest biomass reached 0.87. The R for P-band VV backscattering power at 5 m is 0.71 and 10 m is 0.72. Backscattering coefficient in HH polarization and vertical backscattering power at 5 m and 10 m were applied to construct a model for hemi-boreal forest AGB estimation by backward step-wise regression and cross-validation approach. The results showed that the estimated forest AGB ranges from 19 to 240 t/ha, and the constructed model obtained a higher R and smaller RMSE, the value of R is 0.91, RMSE is 30.43 t/ha at Remningstorp test site.  相似文献   

Ground-based phase wind-up and its application in yaw angle determination     

M. Cai  W. Chen  D. Dong  C. Yu  Z. Zheng  F. Zhou  M. Wang  W. Yue 《Journal of Geodesy》2016,90(8):757-772

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A closed-loop EKF and multi-failure diagnosis approach for cooperative GNSS positioning     

Haiying Liu  Xiaolin Meng  Zhiming Chen  Scott Stephenson  Pekka Peltola 《GPS Solutions》2016,20(4):795-805

Current cooperative positioning with global navigation satellite system (GNSS) for connected vehicle application mainly uses pseudorange measurements. However, the positioning accuracy offered cannot meet the requirements for lane-level positioning, collision avoidance and future automatic driving, which needs real-time positioning accuracy of better than 0.5 m. Furthermore, there is an apparent lack of research into the integrity issue for these new applications under emerging driverless vehicle applications. In order to overcome those problems, a new extended Kalman filter (EKF) and a multi-failure diagnosis algorithm are developed to process both GNSS pseudorange and carrier phase measurements. We first introduce a new closed-loop EKF with partial ambiguity resolution as feedback to address the low accuracy issue. Then a multi-failure diagnosis algorithm is proposed to improve integrity and reliability. The core of this new algorithm includes using Carrier phase-based Receiver Autonomous Integrity Monitoring method for failure detection, and the double extended w test detectors to identify failure. A cooperative positioning experiment was carried out to validate the proposed method. The results show that the proposed closed-loop EKF can provide highly accurate positioning, and the multi-failure diagnosis method is effective in detecting and identifying failures for both code and carrier phase measurements.  相似文献   

A Method for Dynamic Risk Assessment and Management of Rockbursts in Drill and Blast Tunnels     

Guo-Feng Liu  Xia-Ting Feng  Guang-Liang Feng  Bing-Rui Chen  Dong-Fang Chen  Shu-Qian Duan 《Rock Mechanics and Rock Engineering》2016,49(8):3257-3279

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A Further Study on Wave Propagation Across a Single Joint with Different Roughness     

X. Chen  Jian Chun Li  M. F. Cai  Y. Zou  J. Zhao 《Rock Mechanics and Rock Engineering》2016,49(7):2701-2709

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Assessment of storm surge inundation and potential hazard maps for the southern coast of Taiwan     

Wei-Bo Chen  Wen-Cheng Liu 《Natural Hazards》2016,82(1):591-616

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Evaluation of soil erosion vulnerability in the Zhuxi watershed,Fujian Province,China   总被引：2，自引：0，他引：2  

Shifa Chen  Xuan Zha 《Natural Hazards》2016,81(3):1589-1610

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