May-June precipitation reconstruction of southwestern Anatolia, Turkey during the last 900 years from tree rings   总被引：1，自引：0，他引：1  

Ramzi Touchan  Ünal Akkemik  Nesat Erkan 《Quaternary Research》2007,68(2):196-202

A May-June precipitation reconstruction (AD 1097-2000) has been developed for southwestern Anatolia in Turkey, the longest reported to date in this region. The reconstruction was derived from a regional Juniperus excelsa chronology that was built from material sampled at four sites in the Antalya and Mersin Districts. The regional tree-ring chronology accounts for 51% of the variance of instrumentally observed May-June precipitation. The years AD 1518 to 1587 are the most humid period in the reconstruction, coinciding with a major shift in European climate. The driest 70-year period in the reconstruction is AD 1195 to 1264. The period AD 1591-1660 represents the third driest and was characterized by instability climatically, politically, and socially in Anatolia.  相似文献   

Regional atmospheric circulation change in the North Pacific during the Holocene inferred from lacustrine carbonate oxygen isotopes, Yukon Territory, Canada     

Lesleigh Anderson  Mark B. Abbott  Bruce P. Finney  Stephen J. Burns 《Quaternary Research》2005,64(1):21-35

Analyses of sediment cores from Jellybean Lake, a small, evaporation-insensitive groundwater-fed lake, provide a record of changes in North Pacific atmospheric circulation for the last ∼7500 yr at 5- to 30-yr resolution. Isotope hydrology data from the southern Yukon indicate that the oxygen isotope composition of water from Jellybean Lake reflects the composition of mean-annual precipitation, δ¹⁸O_p. Recent changes in the δ¹⁸O of Jellybean sedimentary calcite (δ¹⁸O_ca) correspond to changes in the North Pacific Index (NPI), a measure of the intensity and position of the Aleutian Low (AL) pressure system. This suggests that δ¹⁸O_p variability was related to the degree of fractionation during moisture transport from the Gulf of Alaska across the St. Elias Mountains and that Holocene shifts were controlled by the intensity and position of the AL. Following this model, between ∼7500 and 4500 cal yr B.P., long-term trends suggest a predominantly weaker and/or westward AL. Between ∼4500 and 3000 cal yr B.P. the AL shifted eastward or intensified before shifting westward or weakening between ∼3000 and 2000 cal yr B.P. Rapid shifts eastward and/or intensification occurred ∼1200 and 300 cal yr B.P. Holocene changes in North Pacific atmospheric circulation inferred from Jellybean Lake oxygen isotopes correspond with late Holocene glacial advances in the St. Elias Mountains, changes in North Pacific salmon abundance, and shifts in atmospheric circulation over the Beaufort Sea.  相似文献   

熊耳地体南侧中晚元古代地层碳氧同位素组成：CMF模式的证据   总被引：5，自引：9，他引：5  

祁进平  张静  唐国军 《岩石学报》2005,21(5):1365-1372

前人运用 CMF 模式(碰撞造山成岩成矿与流体作用模式)推断熊耳地体金银矿床的成矿流体主要来自其南侧中晚元古代地层(官道口群和栾川群)的陆内俯冲变质脱水作用,并推测该套地层富放射成因铅和锶,δ~(13)C 和δ~(18)O 值较高。为检验该推论和 CMF 模式正确与否,作者对该套地层开展了研究,本文报道了碳氧同位素研究结果。13件岩石样品δ~(18)O 值变化于9.1‰～16.7‰,平均13.3‰;4件δ~(13)C_(CaCO_3)值为-2.8‰～0.8‰,平均-0.9‰,计算表明,该套地层在320～373℃(熊耳地体多数矿床早阶段成矿温度范围)变质脱水所形成流体的δ~(18)O值为2.6‰～14.6‰,与推测结果一致,覆盖了熊耳地体已有早阶段成矿流体的δ~(18)O值(5.1‰～12.6‰),计算的中晚元古代地层变质流体的δ~(13)C_(CO_2)随介于-0.7‰～4‰,也与熊耳地体成矿流体的δ~(13)C_(CO_2)值(-2.1‰～4‰,成矿早阶段一般δ~(13)C_(CO_2)>0)一致。如此以来,我们的研究结果证明了前人的推论和 CMF 模式的科学性与实用性,CMF 模式可以用于指导熊耳地体或类似构造环境的矿床勘查和地质研究。  相似文献   

Isotope geochemistry of the mafic dikes from the Vazante nonsulfide zinc deposit, Brazil   总被引：2，自引：0，他引：2  

M. Babinski  L.V.S. Monteiro  A.H. Fetter  J.S. Bettencourt  T.F. Oliveira   《Journal of South American Earth Sciences》2005,18(3-4):293-304

The Vazante Group, located in the northwestern part of Minas Gerais, hosts the most important zinc mine in Brazil, the Vazante Mine, which represents a major known example of a hypogene nonsulfide zinc deposit. The main zinc ore is represented by willemite and differs substantially from other deposits of the Vazante-Paracatu region, which are sulfide-dominated zinc-lead ore. The age of the Vazante Group and the hosted mineralization is disputable. Metamorphosed mafic dikes (metabasites) that cut the metasedimentary sequence and are affected by hydrothermal processes recently were found and may shed light on the geochronology of this important geological unit. Zircon crystals recovered from the metabasites are xenocrystic grains that yield U–Pb conventional ages ranging from 2.1 to 2.4 Ga, so the basement of the Vazante Group is Paleoproterozoic or has metasedimentary rocks whose source area was Paleoproterozoic. Pb isotopes determined for titanite separated from the metabasites have common, nonradiogenic Pb compositions, which prevents determination of their crystallization age. However, the Pb signatures observed for the titanite crystals are in agreement with those determined for galena from the carbonate-hosted Zn–Pb deposits hosted by the Vazante Group, including galena from minor sulfide ore bodies of the Vazante deposit. These similarities suggest that the metalliferous fluids that affected the metabasites may have been those responsible for galena formation, which could imply a similar lead source for both nonsulfide and sulfide zinc deposits in the Vazante–Paracatu district. This common source could be related to deep-seated, basin-derived, metalliferous fluids associated with a long-lived hydrothermal system related to diagenesis and deformation of the Vazante Group during the Neoproterozoic.  相似文献   

姚安金矿床成因机制研究     

钱祥贵  李志伟  柏坚 《云南地质》2002,21(1):42-49

姚安金矿床矿石品位富，载金矿物及其共生矿物组合较为特殊，复杂。从含矿段岩石组合，围岩，含金矿石，含金矿物及火山－次火山侵入岩的稀土元素和微量元素特征，结合矿石的同位素及包裹体分析资料对比研究认为：（1）成矿金质来源于围岩（侏罗系碎屑岩）和火山－次火山岩；（2）金成矿滞后于岩浆岩的侵入期，与构造活动同期或稍晚。  相似文献   

砾石钙膜显微纹层定年方法及黄河黑山峡高阶地形成年代厘定          下载免费PDF全文

郑文俊  郭华  刘百篪 《地震工程学报》2003,25(3):233-239

砾石钙膜是一种在干旱—半干旱环境中形成，反映环境和气候变化的沉积物，保留了比较完整的环境和气候信息，可用来分析古气候和测定形成年代．本通过砾石钙膜的沉积原理讨论，认为钙膜中的显微明暗纹层变化反映了气候变化过程，其明暗度变化曲线可与其它测年方法(深海岩芯氧同位素曲线、黄土剖面粒度曲线、古地磁变化、构造事件等)作对比，得到其形成年代的信息．而砾石钙膜形成年代可代表所在地貌面的年龄．本以此方法对黄河黑山峡高阶地的形成时代进行了厘定．  相似文献   

孟加拉湾深海氧同位素2、3期上升流活动——北印度洋冬季风的实证   总被引：2，自引：4，他引：2       下载免费PDF全文

丁旋  方念乔  陈萍  宋成兵 《第四纪研究》2003,23(1):53-59

北印度洋季风研究的经典地区是上升流活跃的阿拉伯海和索马里海盆,孟加拉湾地区季风强弱的变化则是以浮游有孔虫壳体氧同位素值反映的淡水输入量大小来指示的.文章通过对孟加拉湾的MD77181岩芯的浮游有孔虫定量分析、氧碳稳定同位素分析,对比东经90°海岭的MD81349岩芯的同类分析结果,发现孟加拉湾地区在深海氧同位素2、3期出现上升流生物种丰度上升、表层水古生产力升高、表层水温度下降、温跃层变浅、盐度增加等指示存在上升流活动的现象,说明当时该区东北冬季风增强.特别的是间冰段深海氧同位素3期各古环境的代用指标都形成记录上最突出的峰值,且在同期背景值上叠加着强烈的波动,认为此现象应是印度季风区夏季季风和冬季季风强盛期的相互转换、水体的垂直循环运动等环境信号和控制机制在该区的反映.  相似文献   

Effects of sulphate reduction and geogenic CO2 incorporation on the determination of 14C groundwater ages – a case study of the Palaeogene groundwater system in north-eastern Syria     

Zuhair Kattan 《Hydrogeology Journal》2002,10(4):495-508

Groundwater from the Palaeogene aquifer system in north-eastern Syria has been studied using chemical and isotopic methods to determine the effects of carbonate dissolution, sulphate reduction and geogenic CO₂ incorporation in the dilution of ¹⁴C activity, and later to correct the conventional ¹⁴C water ages. The reason for this non-classical approach of correction is because the groundwater in this karstified and Nummulitic carbonate aquifer occurs under confined and partly confined conditions, and is located in an area very close to deep faults and fractures. Furthermore, the interconnection with the Upper Cretaceous formations, which commonly contain gypsum and hydrocarbons, can facilitate the processes of sulphate reduction and geogenic CO₂ incorporation, which should not be excluded. The dilution factor related to carbonate dissolution was estimated to be about 0.60–0.75. The dilution factor associated with sulphate reduction, which only depends on H₂S content, was rather low (about 0.95). However, as a result of the local tectonic setting in this area, the influence of geogenic CO₂ incorporation was clearly high. The dilution factor associated with this effect ranges between 0.24–0.64. Consequently, the corrected ¹⁴C ages are considerably reduced compared with those determined by classical models. Accordingly, the groundwater in the study area can be divided into three main groups: (1) fresh, shallow and cold water of less than 1 ka age; (2) brackish, deep and thermal water of rather old age (10.9–12.3 ka B.P.); and (3) an admixed groundwater of intermediate quality and age (1.9–6.7 ka B.P.). Electronic Publication  相似文献   

南秦岭佛坪片麻岩系同位素年代学及其地质意义   总被引：10，自引：0，他引：10  

王根宝 《西北地质科学》1997,18(2):21-25

佛坪片麻岩系是秦岭造山带核部所出露的众多古老块体之一，笔者利用锆石Ｕ－Ｐｂ法测得１８５３～２２８４Ｍａ年龄数据，是目前该区所获最老年龄资料，可能接近于其成岩时代。其地质意义在于：①证实佛坪片麻岩成岩时代为早元古代；②４２４±５Ｍａ、３００±１７Ｍａ和２１２．８土９．４Ｍａ的年龄信息表明加里东－印支期构造热事件对佛坪片麻岩有重大影响，③所获２１３．２～１４４７Ｍａ等大量表面年龄数据是片麻岩长期演化过程中多次地质作用综合后的混合年龄。  相似文献   

东天山康古尔塔格金矿带年代学研究   总被引：20，自引：0，他引：20       下载免费PDF全文

姬金生  杨建国 《地质科学》1996,31(1):80-89

康古尔塔格金矿带分布于东天山石炭系中、下统火山岩区,近年来发现了浅成低温热液型、韧性剪切带型和石英脉型3种成因类型的金矿。经Rb-Sr等时线法、U-Ph法、⁴⁰Ar/³⁹Ar法等地质年代学研究,认为容矿岩石火山岩的年龄为300-280Ma;矿化发生在海西晚期到印支早期(270-220Ma),经历了多期次的成矿作用;各矿区的花岗质侵入岩与成矿有一定的时空关系。  相似文献