Proterozoic Dyke Swarms of the Siberian Craton and Their Geodynamic Implications

正We present a summary of late Paleoproterozoic to Neoproterozoic mafic magmatism in the Siberian craton which allows us distinguish following main pulses of mafic dyke emplacement:1)1860–1850 Ma mafic dykes are localized within the     

Neoarchaean-Palaeoproterozoic Mafic Dyke Swarms from the Singhbhum Granite Complex,Singhbhum Craton,Eastern India: Implications for Identification of Large Igneous Provinces and Their Possible Continuation on Other Formerly Adjacent Crustal Blocks

正The Singhbhum craton of the eastern India consists of the Singhbhum Granite Complex(SGC)and the Chotanagpur Gneissic Complex(CGC)separated by the Singhbhum Mobile Belt(SMB).The CGC is intruded by Mesoproterozoic as well as Cretaceous mafic dykes;in     

Geochronology of Mafic Intrusions

正Baddeleyite(ZrO_2)is today recognized as a key mineral for dating the emplacement of mantle-derived rocks such as gabbros,alkaline(Si-poor)rocks and dolerite dykes and sills,but also in hydrothermally-driven deposits(Heaman     

Tourmaline Composition of the K??lada? Au Deposit, U?ak, Turkey

Please refer to the attachment(s) for more details     

Eckfeld Maar: Window into an Eocene Terrestrial Habitat in Central Europe

<正>To mark the occasion of the 175th anniversary of the Rheinische Naturforschende Gesellschaft in 2009 and of the centennial of the Mainz Natural History Museum in 2010,we present a short account of our present knowledge of the Eckfeld Maar after 20 years of continuous research.This paper does not attempt to include all of the detailed results on the geology of the Eckfeld site or its biota.To date,nearly 250 papers and books have been published since the start of our project.An up-to-date list of these publications can be found at www.eckfeldermaar. de.     

Hydrogeochemistry and Water Quality Evaluation along the Flow Path in the Unconfined Aquifer of the Düzce Plain,North-western Turkey

The Düzce Plain has a multi-aquifer system, which consists of a near surface unconfined aquifer, along with first and second deeper confined aquifers. Hydrochemical evolution and water quality are related to infiltration of the precipitation, recharge from the formations surrounding the plain, flow path of groundwater and the relationship between surface and groundwater. The groundwater in the unconfined aquifer flows towards the Efteni Lake and the Büyük Melen River. Surface waters are divided into two main hydrochemical facies in the study area: (a) Ca2+–HCO3?; and (b) Ca2+, Mg2+–HCO3-, SO42-. The groundwater has generally three main hydrochemical facies: (a) Ca2+–HCO3-; (b) Ca2+, Mg2+–HCO3-; and (c) Ca2+, Mg2+–HCO3-, Cl-. The hydrochemical facies "a" and "b" dominate within shallow depths in recharge areas under rapid flow conditions, while hydrochemical facies "c" characterizes shallow and mixed groundwater, which dominate intermediate or discharge areas (near Efteni Lake and Büyük Melen River) during low flow conditions and agricultural contamination. Calcium and bicarbonate ions, total hardness and electrical conductivity of total dissolved solids (EC–TDS) values increase along the groundwater flow path; but these parameters remain within the limits specified by the standards set for industrial and agricultural usages.     

2000年以来库尔勒市果树冻害气象条件综合分析

2000年以来,巴州地区出现了3次较明显的冻害天气,其中库尔勒2次,焉耆盆地和静1次。本文从低温天气前期气候特征、低温强度及持续时间、积雪、地温、冻土深度等方面入手对库尔勒2000年以后的2次果树冻害天气进行综合分析,找出能提前表征果树冻害的相关气象参数,为巴州林果业气象决策服务提供必要参考,提高气象防灾减灾能力。     

投资环境图编制初探

投资环境图编制初探黄永砥，蔡孟裔（华东师范大学）一、投资环境及投资环境图编制１．有关投资环境的最基本概念投资环境是提供与吸引投资者进行各类商务活动的一切外部条件的总称。投资环境可以包括很多方面，如把自然环境及基础设施等有形的实体称为硬环境；把政治制度...     

WILD T_3经纬仪竖盘光路检修工艺

由于T_3仪器的竖盘光路采用与T_2不同的结构，因此竖盘光路的检修具有其特殊性。本文着重介绍竖盘的拆卸步骤，同时介绍一种简单的竖盘光路调整附加设备，从而简化了光路的调整。