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新疆要拉套山花岗岩类的K—Ar和^40Ar—^39Ar同位素定年 总被引:3,自引:1,他引:3
新疆西北部阿拉套山南坡的花岗岩体的^40Ar-^39Ar和K-A定年结果表明它们都是海西期侵入体,侵入活动可分为三个阶段:最早的东部的岩基,岩性为花岗闪长岩和钾长花岗岩,年齿约305Ma;而后是西部的二长花岗岩和钾长花岗岩,与钨锡成矿有关,年龄约290Ma;最晚的是最西部的二长花岗岩,年龄约280-270Ma。岩浆活动中心有自动东或北东向西或南西迁移的趋势。 相似文献
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浙江省陈蔡群的^40Ar—^39Ar年龄与变质年代 总被引:2,自引:0,他引:2
本文对陈蔡群变质岩进行了40Ar-39Ar年龄测定。其中在诸暨陈蔡测得的415.1Ma的坪年龄代表了主变质晚期的冷却年代。采自义乌尚阳的样品受燕山期火山活动影响有明显的氩丢失,与主变质有关的年龄亦明显降低,仅315.3Ma。在龙泉东书获得的年龄谱和当地广泛发育的混合岩化作用有关,276.9Ma的坪年龄为这次热事件的冷却年代。根据对现有年代资料的讨论,可以认为不同衰变体系记录了陈蔡群主变质事件的演化。Rb-Sr体系在变质早中期实现均匀化,年龄值为552.4~660.6Ma。锆石、磷灰石在变质高峰期形成的铅丢失年龄为508,4~578Ma。上述资料表明陈蔡群主变质年代属加里东期。 相似文献
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滇西南那邦变质基性岩两其变质作用的^40Ar/^39Ar年代学研究 总被引:4,自引:3,他引:1
中缅边界那邦变质基性岩出圳于东缅著名的Mogok带的东缘。那邦基性麻粒岩经历了早期麻粒岩相、晚期角闪岩相的两期变质作用的改造。早期变质作用的矿物石榴石和单斜辉石的^40Ar/^39Ar年龄谱图和等时线年龄均显示两组年龄:74 ̄76Ma和23 ̄24Ma。晚期变质作用矿物角闪石的K-Ar法得出23Ma,角闪石和斜长石的^40Ar/^39Ar年龄谱图和等时线年龄均显示23 ̄24Ma。晚期变质作用矿物角闪 相似文献
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武当地块基性岩墙群^40Ar—^39Ar定年及其地质意义 总被引:12,自引:1,他引:11
通过对南秦岭武当地块内变形变质基性岩墙群中的角闪石、黑云母矿物的40Ar-39Ar定年,获得角闪石三组年龄,分别为高温坪年龄694.4±21Ma,中温坪年龄384.4±3Ma(相应等时线年龄为383.3±10Ma)和低温视年龄240~180Ma。黑云母单一坪年龄为235.3±2Ma(相应等时年龄为236.7±6Ma)。结合本区基性岩墙已获得的Sm-Nd全岩等时年龄(782±164Ma)分析,782±164Ma~694.4±21Ma代表岩墙侵位、冷却过程的时间,提供了武当地块裂解的构造事件年龄;384.4±3Ma和约240Ma则代表岩墙群侵位后两期重要构造-热事件的改造年龄。上述为武当地块的构造作用过程和南秦岭构造带的形成、演化提供了重要证据。 相似文献
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合肥盆地三尖铺组^40Ar—^39Ar同位素年代地层学研究 总被引:8,自引:2,他引:6
合肥盆地南缘中生代红层层序及时代,由于缺乏可靠的化石依据,曾几经变动人为因素很大。根据三尖铺组红层中泥炭在沉积或成岩作用条件下形成的伊利石之^40Ar-^39Ar定年,其坪年龄为157.7 ̄159.95Ma,等时线年龄为157.2 ̄159.9Ma,并用K-Ar法测年进行对比和验证,其值为151.8 ̄155.8Ma,故确定其时代下限应为中株罗世晚期(卡洛维期),上限可能达晚侏罗世早期(牛津期)。^4 相似文献
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广东东镇岩体微区^40Ar/^39Ar年龄及其意义 总被引:3,自引:0,他引:3
采用激光显微探针^40Ar/^39Ar测年技术(简称微区^40Ar/^39Ar法)对广东云开地区东镇岩体含眼球体的片麻状花岗质岩石中单矿物作了同位素年龄测定,获得眼球体内核中的巨晶状钾长石年龄(419.40±4.37)×10^6a。眼球体角缘中重结晶微粒状钾长石年龄(272.63±3.13)×10^6a,眼球体外壳中的强应变长条纹黑云母年龄(177.84±2.29)×10^a。暗色条带中的弱应变板 相似文献
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青藏高原西部的抬升速率:叶城—狮泉河花岗岩^40Ar—^39Ar年龄的地质解释 总被引:19,自引:2,他引:17
通过对叶城-狮泉河剖面花岗岩中黑云母40Ar-39Ar法年龄研究,获得西昆仑北岩带库地岩体海拔高度2950m和2850m黑云母的封闭年龄分别为396.9Ma和388.9Ma,西昆仑南岩带塔西土路克、三十里营房和奇台大坂岩体黑云母的封闭年龄为195.8~183.9Ma,班公湖-喀喇昆仑北岩带日土岩体黑云母封闭年龄为80.3~79.6Ma,其时代分别为加里东期、印支期和燕山晚期。年龄结果表明,同一岩体海拔高的黑云母封闭年龄大于海拔低的黑云母封闭年龄,根据海拔高程差和坪年龄差计算出岩体的抬升速率,表明青藏高原西部从加里东期到燕山晚期,隆起速度有增大的趋势,而且具脉动性。 相似文献
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激光显微探针40Ar/39Ar 定年方法研究 总被引:12,自引:0,他引:12
实验结果表明,在激光探针40Ar/36Ar年龄和常规40Ar/39Ar年龄之间有较好的吻合性,多次测定BSP-1角闪石国际标样年龄值大部分在2020-20900Ma之间,多次测定周口店花岗岩中ZBH-25国内标样年龄值大部分在130-135.9Ma。分析区域可小到30μm以下(激光束本身可被聚集到10μm以下)。研究表明,激光显微探针技术在下述工作中将是一个极有前途的工具①测定不易大量获取的样品年龄;②研究遭受多期地质历史事件作用因而有复杂Ar状态的岩石年代;③研究在岩石样品中填充在不同结构位置上的矿物年 相似文献
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Marvin A. Lanphere 《Quaternary Research》2000,53(3):294
K–Ar and 40Ar/39Ar ages have been measured on nine mafic volcanic rocks younger than 1 myr from the Snake River Plain (Idaho), Mount Adams (Washington), and Crater Lake (Oregon). The K–Ar ages were calculated from Ar measurements made by isotope dilution and K2O measurements by flame photometry. The 40Ar/39Ar ages are incremental-heating experiments using a low-blank resistance-heated furnace. The results indicate that high-quality ages can be measured on young, mafic volcanic rocks using either the K–Ar or the 40Ar/39Ar technique. The precision of an 40Ar/39Ar plateau age generally is better than the precision of a K–Ar age because the plateau age is calculated by pooling the ages of several gas increments. The precision of a plateau age generally is better than the precision of an isotope correlation (isochron) age for the same sample. For one sample the intercept of the isochron yielded an 40Ar/36Ar value significantly different from the atmospheric value of 295.5. Recalculation of increment ages using the isochron intercept for the composition of nonradiogenic Ar in the sample resulted in much better agreement of ages for this sample. The results of this study also indicate that, given suitable material and modern equipment, precise K–Ar and 40Ar/39Ar ages can be measured on volcanic rocks as young as the latest Pleistocene, and perhaps even the Holocene. 相似文献
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桐柏——大别山主要构造热事件及40Ar/39Ar地质定年研究 总被引:13,自引:0,他引:13
桐柏——大别山是一条复合造山带。在其演化过程中曾经历了扬子旋回(1000Ma-761Ma)和加里东旋回(470Ma-401Ma)两个板块构造旋回的俯冲-碰撞造山作用,之后又经历了早、中华力西(357Ma-314Ma)的平移走滑和晚华力西(286Ma-261Ma)、印支期(224Ma-185Ma)、燕山期(130Ma-111Ma)逆掩或逆冲推覆的陆-陆叠覆造山作用。印支期的高压超高压变质岩系是在陆-陆叠覆造山作用下形成的。燕山期的造山不仅具显著的深层次构造岩浆作用特点,而且还伴随快速的隆升作用。 相似文献
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赣东北地区重要火成岩的40Ar/39Ar年龄 总被引:11,自引:0,他引:11
在赣东北蛇绿混杂岩带发现含晚古生代放射虫硅夺,测定了该带内的和带外几个关键地点的火山岩和辉长岩的^40Ar/^30Ar同位素地南年龄,获得了以下结果:火山岩的坪年龄为434.9-486.7Ma,辉长岩的坪年龄为232.5-266.3Ma,因此可以肯定赣东北地区有早生代晚期的火山活动,证实了上述火成冉不是中、新元古代的产物,它们中的一部分与晚古生代硅质岩都是蛇绿岩套的成员,属该区晚古生代洋壳的组成部 相似文献
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Leah E. Morgan Madicken Munk Brett Davidheiser‐Kroll Nicholas H. Warner Sanjeev Gupta Rachel Slaybaugh Patrick Harkness Darren F. Mark 《Geostandards and Geoanalytical Research》2017,41(3):381-396
The chronology of the Solar System, particularly the timing of formation of extra‐terrestrial bodies and their features, is an outstanding problem in planetary science. Although various chronological methods for in situ geochronology have been proposed (e.g., Rb‐Sr, K‐Ar), and even applied (K‐Ar), the reliability, accuracy, and applicability of the 40Ar/39Ar method makes it by far the most desirable chronometer for dating extra‐terrestrial bodies. The method however relies on the neutron irradiation of samples, and thus a neutron source. Herein, we discuss the challenges and feasibility of deploying a passive neutron source to planetary surfaces for the in situ application of the 40Ar/39Ar chronometer. Requirements in generating and shielding neutrons, as well as analysing samples are described, along with an exploration of limitations such as mass, power and cost. Two potential solutions for the in situ extra‐terrestrial deployment of the 40Ar/39Ar method are presented. Although this represents a challenging task, developing the technology to apply the 40Ar/39Ar method on planetary surfaces would represent a major advance towards constraining the timescale of solar system formation and evolution. 相似文献
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Leah E. Morgan Brett Davidheiser-Kroll Klaudia F. Kuiper Darren F. Mark Noah M. McLean Jan R. Wijbrans 《Geostandards and Geoanalytical Research》2023,47(1):91-104
The accuracy and traceability of geochronometers are of vital importance to questions asked by many Earth scientists. The widely applied 40Ar/39Ar geochronometer relies on the co-irradiation of samples with neutron fluence monitors (reference materials) of known ages; the ages and uncertainties of these monitors are critical to our ability to apply this chronometer. Previously, first principles, astronomical and optimisation calibrations have been made. The first principles method for determining the age of monitor minerals is the K-Ar method, which involves measurement of their 40K and 40Ar* abundances. The AQuA (Absolute Quantities of Argon) pipette system, which emits calibrated quantities of 40Ar* via the ideal gas law, was used to calibrate the sensitivity of the system across a range of source pressures and estimate 40Ar* abundances in neutron fluence monitors. These 40Ar abundances were combined with existing 40K abundance data for these monitors. Ages for HD-B1 and MD2 (GA1550) biotite fluence monitors were calculated and combined with intercalibration data for HD-B1 and Fish Canyon sanidine (FCs) to determine ages for FCs. Current results do not have the targeted accuracy when compared with previous calibrations; however, we show how the extensive methodology development presented here can be used towards making reliable future measurements. 相似文献
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Vasconcelos P M 《中国地质大学学报(英文版)》2004,15(3):312-323
INTRODUCTIONModern4 0 Ar/ 39Arlaserstep heatinganalysishasbeensuccessfullyappliedtodateverysmallmineralgrainsfromdiversegeologicalenvironments .Thefineresolutionofthismethodhasgreatlyhelpovercomeproblemsintrinsicintradi tionalK Armethod ,inducedbyexcessargon ,argonlossbythermalresetting ,39Arrecoilduringirradiation ,andinter growthsand/orcontaminationofdifferentgenerationminer als ,withintheanalyzedmineral (Smithetal.,1998;Vas concelosetal.,1994 ) .Supergenemanganeseoredepositsareeconom… 相似文献