Supply-Demand Situation and Exploration of Mineral Resources in China during 2016–2017

正During 2016-2017,both the supply and demand of China's main mineral resources continued to grow.The import of major energy resources and metal ore resources,such as iron ores,crude oil,natural gas,coal and bauxite,except for copper,has shown a substantial increase(Table1).In order to guarantee economic development needs,the     

Early Cretaceous A-type Granites in the Dandong Area,NE China and its Geodynamical Implications

A-type granites, as an important petrologic sign to build up environmental recognition, were mainly formed in extensional tectonic settings. A biotite syenogranite from the Fenghuangshan pluton in Dandong, Liaoning Province gave SHRIMP zircon U-Pb ages of 122.5 ± 1.6 Ma, 124.9 ± 1.7 Ma and 126.9 ± 1.1 Ma. The monzogranites have SHRIMP zircon U-Pb ages of 118.2 ± 1.6 Ma, 128.1 ± 1.7 Ma and 131.6 ± 1.9 Ma, giving an emplacement age for the pluton in the Early Cretaceous. SiO2 is 65.48–74.49 wt%, whereas that of K2O is 4.16–6.44 wt%, and that of Na2O is 2.99–4.70 wt%. They also contain 13.24–15.76 wt% of Al2O3, with an A/CNK ratio of 0.92–1.10, averaging 1.02. The alkalinity rate (AR) ranges from 2.68 to 5.12, and this range is within the AR of peraluminous type rocks. The granites of Fenghuangshan pluton are characterized by high contents of Na and K and low contents of Ca (thermophile element) and Mg, which are features of A-type granites. The (Na2O + K2O) ? Fe2O3* × 5 ? (CaO + MgO) × 5 discrimination diagram also shows that Fenghuangshan pluton is an A2-type granite. The above granite has zircon εHf(t) values ranging from ?17.06 to ?9.09, with single-stage Hf model ages (TDM) of 1141 Ma to 1498 Ma and two-stage Hf crustal model ages (TDMC) of 1762 Ma to 2263 Ma. A comprehensive analysis suggests that the Fenghuangshan pluton might have been formed from the lithospheric-plate sliding during the late stages of evolution of hot rift structures and might have been closely associated with the tectonic settings of Mesozoic Eurasia and the ancient Pacific Plate.     

登陆中国热带气旋台风季参数的气候特征分析

 利用1949-2006年登陆中国的热带气旋（TC）资料,分析登陆TC台风季参数的气候特征,结论如下：1) 登陆中国的初旋①以南海生成为主（占5成半）,终旋以西太平洋为主（高达8成）,近50多年来初、终旋源地分别呈现向东北、西北移动的趋势;2) 广东（浙江）初旋最早（晚）,广西、浙江（广东、海南）终旋较早（晚）,广东（浙江）台风季最长（短）。近50多年来除浙江台风季呈延长的线性趋势外,其余各省台风季变短或变化不明显。     

48年来广东省不同区域的温度变化特征

根据全省86个气象站1960～2007年的温度资料,研究了48年来广东省北部、中部、东南部和西南部4个区域的温度变化特征。结果表明,4个区域的年平均气温均呈上升趋势,最低值分别出现在1976和1984年,最高值为1998年,增温速率南部沿海高于内陆,东南部为0．026℃／年,西南部0．023℃／年,中部0．021℃／年,北部0．012℃／年。各区域年平均气温20世纪60、70和80年代变化不大,90年代升高最明显。从季节分布看,各区域增温速率冬季最为明显,为0．025～0．035℃／年,秋季次之,为0．012—0．031℃／年,冬、秋增温速率均通过了95％的显著性检验;春季为0．011～0．019℃／年,夏季最小,为0．001—0．019℃／年,春、夏增温速率大多没有通过95％的显著性检验。     

近50年影响珠江流域热带气旋的气候特征分析

对1961～2010年影响珠江流域的热带气旋(TC)进行统计分析,结果得到,近50年年均4.24个TC影响珠江流域,其中台风以上等级1.02个,两者以每10年0.3个逐渐减少。其平均中心气压为984.0 hPa,平均极端最低气压为968.7 hPa,前者无明显的变化趋势,后者每10年减弱1.4 hPa。影响珠江流域热带气旋生成源地的平均最南位置为10.3°N,平均最北位置为17.5°N,两者均表现出向北移动的倾向,其中前(后)者每10年北移0.9°(0.6°),近几年影响珠江流域热带气旋生成源地位置向10°N～19°N区间汇聚。影响珠江流域热带气旋的平均初旋日在7月1日,终旋日在9月15日,台风季为76.5 d,其中初(终)旋日每10年推迟(提前)1.3(6.0)d,台风季以每10年8.2 d的速率减少,20世纪60年代和90年代中后期至21世纪前期处于偏短时期,近几年又开始呈现增长趋势。     

2000年以来江淮梅雨带北移的可能成因分析

2000年以来长江中下游地区梅雨量偏少年出现的频率大大增加,梅雨量进入一个相对偏少的时期.观测资料分析表明,2000-2005年江淮梅雨带的位置较1971-1999年向北移动了2个纬距,淮河流域降水增加了20%.采用1971-2005年NCEP/NCAR再分析资料,从高层风场、中层位势高度场、低层相对涡度、垂直速度、整层视热源Q1和视水汽汇Q2等角度分析了近6年大气环流的异常,进一步研究得到:西太平洋副热带高压脊位置的北移、东亚夏季风的加强以及冷空气的减弱,可能是导致2000-2005年梅雨带位置北移的原因.     

A preliminary study of the quantitative couplingbetween loess-paleosol sequences and summer monsoon changes

IntroductionRecentscientificresultsshowthatclimahcfactorsaredrivingforcestoenvironmentalchanges,whilesoils(Pajeosols)areoneofthebestrecorders.AlargeareaofloessdeposihonduringandsincetheQuartemareinChinaprovidesfairlyagood"soil"forst'UdythecouplingbetWeenloess-paloesolsequencesandspatio-temporalclimaticchanges.Temporally,high-resoluhonloess-paleosolsequencesontheLoessPlateau--NortheasternTibetanPlateauarethemostconhnuousandcompleteclimaticrecordsterrestrially,whichcorrelateverywellwiththose…     

Phase Equilibria Constraints on Relations of Ore‐bearing Intrusions with Flood Basalts in the Panxi Region,Southwestern China

There are two types of temporally and spatially associated intrusions within the Emeishan large igneous province (LIP); namely, small ultramafic subvolcanic sills that host magmatic Cu-Ni-Platinum Group Element (PGE)-bearing sulfide deposits and large mafic layered intrusions that host giant Ti-V magnetite deposits in the Panxi region. However, except for their coeval ages, the genetic relations between the ore-bearing intrusions and extrusive rocks are poorly understood. Phase equilibria analysis (Q-Pl-Ol-Opx-Cpx system) has been carried out to elucidate whether ore-bearing Panzhihua, Xinjie and Limahe intrusions are co-magmatic with the picrites and flood basalts (including high-Ti, low-Ti and alkali basalts), respectively. In this system, the parental magma can be classified as silica-undersaturated olivine basalt and silica-saturated tholeiite. The equivalents of the parental magma of the Xinjie and Limahe peridotites and picrites and low-Ti basalts are silica-undersaturated, whereas the Limahe gabbro-diorites and high-Ti basalts are silica-saturated. In contrast, the Panzhihua intrusion appears to be alkali character. Phase equilibria relations clearly show that the magmas that formed the Panzhihua intrusion and high-Ti basalts cannot be co-magmatic as there is no way to derive one liquid from another by fractional crystallization. On the other hand, the Panzhihua intrusion appears to be related to Permian alkali intrusions in the region, but does not appear to be related to the alkali basalts recognized in the Longzhoushan lava stratigraphy. Comparably, the Limahe intrusion appears to be a genetic relation to the picrites, whereas the Xinjie intrusion may be genetically related to be low-Ti basalts. Additionally, the gabbro-diorites and peridotites of the Limahe intrusion are not co-magmatic, and the former appears to be derived liquid from high-Ti basalts.     

Ten Major Scientific and Technological Progresses of theChinese Geological Survey in 2018

正The China Geological Survey has annually invested tens of billions of yuan in China's geological surveys in order to set up ten major plans, 60 programs and more than 400 projects, which will deliver hundreds of geological survey results every year. In early 2019, the China Geological Survey organized relevant experts to select ten major achievements among the completed projects of 2018,which were awarded the"Ten Major