塔里木盆地巴楚断隆古生代沉积构造背景和物源区性质的探讨

关于塔里木盆地构造类型和基底性质的认识大致可以分为两种：一种认为它是一个具有前寒武纪陆壳基底的复杂的叠合复合盆地;另一种则认为它是一个具有洋壳（大洋岩石圈）基底的残余的弧后盆地（或由昆仑岛弧、塔中残余岛弧和柯坪-库鲁克塔格残余岛弧挟持的两个残余弧间盆地组成）。和3、和4井位于塔中构造带的巴楚断隆上,取两井的古生界砂岩、粉砂岩样品做主量元素化学分析,用不同方法进行沉积构造背景和物源区性质判别,证明本区志留纪到石炭纪属于稳定的大陆克拉通盆地,沉积物源来自成熟大陆区。这一结果支持关于塔里木具有陆壳基底的认识。     

基于OpenLayers的旅游地图方案研究

本文简要介绍国内最新旅游新闻动态,提出一种基于OpenLayers的多源数据整合方案,进行在线旅游地图服务,此方法定制方便灵活、开发简单,很适合中小型应用。     

Signatures of tectonic‐climatic interaction during the Late Cenozoic orogenesis along the northern Chinese Tian Shan

The Chinese Tian Shan is one of the most actively growing orogenic ranges in Central Asia. The Late Miocene‐Quaternary landscape evolution of northern Tian Shan has been significantly driven by the interaction between tectonic deformations and climate change, further modulated by the erosion of the upstream bedrocks and deposition into the downstream basins. In this study, only the accessible Kuitun River drainage basin in northern Tian Shan was considered, and detrital zircon geochronology and heavy minerals were analyzed to investigate the signature of the driving forces for Miocene sedimentation in northern Tian Shan. This study first confirmed a previously recognized tectonic uplift at ca. 7.0 Ma and further revealed that the basin sediments were mainly derived from the present glacier‐covered ridge‐crest regions during 3.3–2.5 Ma. It is suggested Late‐Pliocene to Early Pleistocene sedimentation was likely a response to the onset of the northern hemispheric glaciation. Although complicated, this study highlights that the tectonic‐climatic interaction during the Late Cenozoic orogenesis can be discriminated in the northern Chinese Tian Shan.     

榆树地震台地电场观测系统运行评价

详细介绍榆树地震台地电场观测系统的运行状况,从数据完整率、静日、扰日变化形态以及相关系数、差值等方面对观测系统运行进行综合评价,结果表明:榆树地震台地电场观测系统运行稳定可靠,能够记录到震前地电场异常变化,可以为地震预测预报研究提供一定依据。     

琼西南三叠纪基性岩脉年代学、地球化学特征及其构造意义

琼西南东方中沙农场发育有基性岩脉,主要由斜长石、单斜辉石和少量角闪石组成。其LA-ICP-MS锆石U-Pb年代学测试表明,该岩脉形成年龄为(242.2±2.6) Ma,和东部地区辉绿岩脉的形成年龄一致。该基性岩脉w（SiO₂）=52.39%~53.44%,w（K₂O+Na₂O）=5.02%~5.71%,具富钾(w（K₂O）=2.45%~3.29%)和高K2O/Na2O值 (0.91~1.63) 特征。该基性岩脉富集轻稀土元素和大离子亲石元素(LIL),轻微Eu负异常(δEu=0.76~0.84),Sr、P弱负异常,明显亏损高场强元素Nb、Ta、Ti。海南约240 Ma的基性岩脉可能来源于被流体交代的地幔源区,形成于华南-印支陆块碰撞后伸展构造环境。     

广东地震台网近震定位精度的经验性GT准则

利用广东地震台网的固定台和流动台记录的2次人工爆破事件,通过随机模拟台网几何形态,获得了该台网近震定位精度的经验性GT（Ground Truth）准则。结果表明：地震定位精度与台网几何形态密切相关;当台网满足以下条件时近震震中定位精度优于2km,震源深度精度优于3km,具有95%的置信度：（1）震中距小于150km的台站数≥7;（2）一级方位角空区<180°;（3）震中距小于10km的台站数≥1。在评估震源深度精度时,发现对于壳内地震,可靠的近台数据能够提高震源深度的精度,而定位时震中距较大的台站数量的增加对震源深度的精度影响很小。最后,应用该GT准则对广东地震台网产出的地震观测报告进行了评估,获得了1160个GT2参考事件。     

渤海海域粉质粘土动力学参数的统计分析

本文整理了26个渤海海域场地土动力学测试报告,并按埋深分段统计了0至115m深度范围内粉质粘土的动力学参数,即动剪切模量比和阻尼比。然后,将本文统计值与袁晓铭推荐值和施春花统计过的北京地区粉质粘土的动力学参数值进行了比较,发现海域场地土与陆地场地土的动力学参数值存在较大差异。之后,选择渤海海域的两个场地,建立了相应的土动力学模型,分别选取实测值、本文统计值、施春花统计值进行场地地震反应分析,发现本文统计值与实测值的结果符合的较好。在渤海海域场地地震反应分析工作中,某些粉质粘土层难以获得动力学参数时,可以参考本文的统计值。     

江西中西部地区白垩纪玄武质岩石的40Ar/39Ar年代学和地球化学研究

对江西中西部两处中生代玄武质岩石进行了^40Ar／^39Ar年代学和元素一同位素地球化学研究,赣西北上高和赣中螺丝山地区玄武质岩石分别给出了137Ma和90Ma的全岩^40Ar／^39Ar年龄。赣西北上高为亚碱性的玄武安山岩,而赣中螺丝山为碱性玄武岩／粗玄岩,两者均以富集LREE和LILE、无明显HFSE亏损为特征。前者初始^86Sr=0．70492～0．70575,εxd(t)=0．61～3．36,落在Samoa-OIB同位素组成范围;后者初始ε=0．70323～0．70350,εxd(t)=6．19～6．93,与Hawaii-OIB的Sr-Nd同位素组成相似。与赣南早中生代(约173Ma)EMⅡ型玄武岩一起暗示该地区中生代岩浆源区有着自岩石圈向软流圈属性演化的时序迁移规律,表明该区自早中生代以来处于软流圈上隆的岩石圈伸展构造背景。     

塔里木盆地轮南低凸起:一个复式油气聚集区

轮南低凸起是塔里木盆地塔北隆起上的一个次级构造单元,多年的勘探开发实践表明,该地区具有多个产层、多种油气藏类型和多期油气充注的特点;多种类型的油气藏,垂向上复合叠置,横向上连片成带,共同构成了一个典型的复式油气聚集区。渤海湾盆地油气勘探和研究的实践中总结出来的复式油气聚集区的理论,已经成功地指导了我国东部和南方含油气盆地的勘探,轮南复式油气聚集区的认识,表明该理论在我国西部挤压型含油气盆地也有广泛的应用和发展前景     

Impacts of Climate Change on Growth Period and Planting Boundaries of Spring Wheat in China under RCP4.5 Scenario

This article contributes to research on how climate change will impact crops in China by moving from ex-post empirical analysis to forecasting. We construct a multiple regression model, using agricultural observations and meteorological simulations by GCMs, to simulate the possible planting boundaries and suitable planting regions of spring wheat under RCP4.5 scenario for the base period 2040s and 2070s. We find that the south boundary of possible planting region for spring wheat spreads along the belt: south Shandong-north Jiangsu-north Anhui-central Henan-north Hubei-southeast Sichuan-north Yunnan provinces, and will likely move northward under RCP4.5 scenario in 2040s and 2070s, resulting in the decrease of possible planting area in China. Moreover, the sowing and harvest date of spring wheat in the base period shows a gradually delayed phenomenon from the belt: south Xinjiang - Gansu, to the Tibet Plateau. As a result, the growth period of spring wheat in China will shorten because of the impacts of climate change. These results imply that a variety of adaptations measures should be set up in response to changing climatic conditions, including developing the planting base for spring wheat, restricting the planting area of spring wheat in sub-suitable areas at risk while expanding the planting area of optimal crops.