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1.
阿尔泰地区中、新生代岩浆活动的同位素年龄证据 总被引：25，自引：1，他引：25
长期以来，对阿尔泰地区有无印支、燕山期岩浆活动一直存在争议。本研究得到以下年龄结果：将军山花岗岩（＾４０Ａｒ／＾３９Ａｒ坪年龄）２２０Ｍａ、康布铁堡花岗岩（＾４０Ａｒ／＾３９Ａｒ高温视年龄）２１４Ｍａ、尚可兰花岗岩（Ｒｂ－Ｓｒ全岩等时线年龄）１７６Ｍａ、阿拉尔花岗岩（＾４０Ａｒ／＾３９Ａｒ坪年龄）１３１Ｍａ。以上数据和与本区处在同一构造单元的前苏联矿区阿尔泰及山区阿尔泰１２个浅色花岗岩锆石Ｕ－Ｐｂ 相似文献
2.
The use of environmental tracers to characterise time scales when investigating groundwater is a technology that has been in use for half a century. Its usefulness is beyond controversy. However, the use of the word “age” for groundwater connected with these techniques is misleading due to its inherent connection to the general understanding of human age. “Age” as in the understanding of human age cannot be determined for groundwater, although it is a useful zero-order concept abundantly used in this context. This paper describes three basic definitions of “age” for groundwater ((1) idealized age as in particle tracking and piston flow, (2) mean residence time involving an age distribution and (3) apparent age) and discusses their context in view of recent developments in numerical groundwater modelling. It further gives arguments why the term “age” is unnecessary in modern hydrology and groundwater management and how not using it can enhance efficiency in system understanding: not using age needs less modelling effort and allows comparing models directly with measured values instead of comparing models with models. 相似文献
3.
斜长岩呈长条带出露于朝鲜半岛南部,侵入到年代约为2.0Ga的Yeongnam前寒武纪基底岩石中,虽然岩石类型简单(斜长岩和辉长岩质斜长岩),但可以同世界已知块状类型斜长岩相对比。这些斜长岩具有几个重要的差别,例如呈层状构造,镁铁相成分是角闪石而不是辉石,并且不具斜方辉石巨晶。应用Rb-Sr和Sm-Nd同位素系统研究这些岩石的年龄和成因,测定出一种页理化辉长岩质斜长岩矿物的Sm-Nd等时线年龄为1678±90Ma,推断其为侵位年龄,因为中生代绿岩相变质期间这些岩石的Sm-Nd同位素体系呈封闭状态。这一年龄和过去曾报道的元古宙块状斜长岩的年龄范围(1.1~1.7Ga)相吻合。认为斜长岩成因可以用所谓元古宙斜长岩事件来解释。斜长岩的岩浆活动对朝鲜半岛南部前寒武纪基底岩石的构造历史有重要意义。全岩εNd(t)值范围-1.6~-5.2,而87Sr/86Sr初始值变化于0.704~0.706之间,据此可解释地幔成因的斜长岩岩浆是在其结晶作用期间吸收了地壳物质的结果。然而不能排除是下地壳源的可能性。 相似文献
4.
The method of obtaining zircon samples affects estimation of the global U-Pb age distribution.Researchers typically collect zircons via convenience sampling and cluster sampling.When using these techniques,weight adjustments proportional to the areas of the sampled regions improve upon unweighted estimates.Here,grid-area and modern sediment methods are used to weight the samples from a new database of 418,967 U-Pb ages.Preliminary tests involve two age models.Model-1 uses the most precise U-Pb ages as the best ages.Model-2 uses the~(206)Pb/~(238)U age as the best age if it is less than a1000 Ma cutoff,otherwise it uses the~(207)Pb/~(206)Pb age as the best age.A correlation analysis between the Model-1 and Model-2 ages indicates nearly identical distributions for both models.However,after applying acceptance criteria to include only the most precise analyses with minimal discordance,a histogram of the rejected samples shows excessive rejection of the Model-2 analyses around the1000 Ma cutoff point.Because of the excessive rejection rate for Model-2,we select Model-1 as the preferred model.After eliminating all rejected samples,the remaining analyses use only Model-1 ages for five rock-type subsets of the database:igneous,meta-igneous,sedimentary,meta-sedimentary,and modern sediments.Next,time-series plots,cross-correlation analyses,and spectral analyses determine the degree of alignment among the time-series and their periodicity.For all rock types,the U-Pb age distributions are similar for ages older than 500 Ma,but align poorly for ages younger than 500 Ma.The similarities(500 Ma)and differences(500 Ma)highlight how reductionism from a detailed database enhances understanding of time-dependent sequences,such as erosion,detrital transport mechanisms,lithification,and metamorphism.Time-series analyses and spectral analyses of the age distributions predominantly indicate a synchronous period-tripling sequence of~91-Myr,~273-Myr,and~819-Myr among the various rock types. 相似文献
5.
Several new multi-dimensional tectonomagmatic discrimination diagrams employing log-ratio variables of chemical elements and probability based procedure have been developed during the last 10 years for basic-ultrabasic, intermediate and acid igneous rocks. There are numerous studies on extensive evaluations of these newly developed diagrams which have indicated their successful application to know the original tectonic setting of younger and older as well as sea-water and hydrothermally altered volcanic rocks. In the present study, these diagrams were applied to Precambrian rocks of Mexico (southern and north-eastern) and Argentina. The study indicated the original tectonic setting of Precambrian rocks from the Oaxaca Complex of southern Mexico as follows: (1) dominant rift (within-plate) setting for rocks of 1117–988 Ma age; (2) dominant rift and less-dominant arc setting for rocks of 1157–1130 Ma age; and (3) a combined tectonic setting of collision and rift for Etla Granitoid Pluton (917 Ma age). The diagrams have indicated the original tectonic setting of the Precambrian rocks from the north-eastern Mexico as: (1) a dominant arc tectonic setting for the rocks of 988 Ma age; and (2) an arc and collision setting for the rocks of 1200–1157 Ma age. Similarly, the diagrams have indicated the dominant original tectonic setting for the Precambrian rocks from Argentina as: (1) with-in plate (continental rift-ocean island) and continental rift (CR) setting for the rocks of 800 Ma and 845 Ma age, respectively; and (2) an arc setting for the rocks of 1174–1169 Ma and of 1212–1188 Ma age. The inferred tectonic setting for these Precambrian rocks are, in general, in accordance to the tectonic setting reported in the literature, though there are some inconsistence inference of tectonic settings by some of the diagrams. The present study confirms the importance of these newly developed discriminant-function based diagrams in inferring the original tectonic setting of Precambrian rocks. 相似文献
6.
大庙斜长岩的40Ar/39Ar年龄测定呈现出一条典型的马鞍型年龄谱,在中温阶段有二个明显的坪年龄1656±15 Ma和1029±7 Ma,结合其构造位置和全球斜长岩分布来看,它们分别代表了侵位年龄和后期热扰动的时代。密云奥长环斑花岗岩中角闪石的40Ar/39Ar坪年龄为1716±21 Ma。两者时空上密切相关,代表了裂谷作用初期非造山环境中双模式岩浆作用产物。斜长岩类和苏长岩之间稀土配分模式的相似性表明,它们明显为同一成因的岩浆分异系列的产物。 相似文献
7.
The results of U–Pb zircon age dating of ultramafic massifs occurring as a chain along the Main Ural Fault zone (MUF) are given. Three groups of ages were obtained (Ma): 2500?2800, 600?2100, and 430?440. The first age group represents the time of origin of the ultramafic rocks in the Earth’s mantle. The second age group records the time of metamorphism of these rocks prior to intrusion into the host rocks. The third age group determines the time of the intrusion of ultramafic magma into the host rocks. It was established that the intrusion of ultramafic magma along the entire length of the Ural ultramafic belt occurred in the age range of 430?440 Ma. 相似文献
8.
在岩相学观察和锆石CL图像研究的基础上,利用LA ICP MS原位分析方法,对北秦岭官坡超高压榴辉岩和伴生的石榴石角闪岩(榴闪岩)进行了详细的锆石微区微量元素和U Th Pb同位素分析,在榴辉岩样品中得到变质年龄为(502±11)Ma,原岩结晶年龄>(657±18)Ma;在榴闪岩样品中得到原岩结晶年龄为(791±6)Ma,变质年龄为487~503 Ma,角闪岩相退变质年龄为(366±4)Ma。岩石地球化学研究显示,北秦岭官坡地区的榴闪岩具有低Si(SiO2质量分数为4916%~5078%),高Ti(TiO2质量分数为228%~283%)、富集LREE、LILE和大部分的HFSE元素,不显Nb、Ta负异常的板内玄武岩特征,与北秦岭超高压榴辉岩地球化学特征一致。结合两者的野外产状、岩相学特征、锆石形貌和年代学研究结果,表明本文研究的官坡地区的榴闪岩是超高压榴辉岩在抬升过程中在角闪岩相条件下退变质的产物。综合两者的年代学研究结果,得到北秦岭地区超高压榴辉岩的变质年龄为(502±11)Ma,原岩结晶年龄为(791±6)Ma,角闪岩相退变质年龄为(366±4)Ma。研究得到的(502±11)Ma的榴辉岩相变质年龄与前人得到的该榴辉岩围岩超高压泥质片麻岩的变质年龄(507±38)Ma以及北秦岭松树沟地区的超高压长英质片麻岩的变质年龄485~514 Ma一致,表明它们经历了同期超高压变质作用。而且,榴辉岩(502±11)Ma的变质年龄与其原岩的结晶年龄(791±6)Ma存在近300 Ma的时间间隔,表明原岩具有板内玄武岩性质的北秦岭官坡超高压榴辉岩不可能是秦岭古生代大洋板块深俯冲的产物,而可能是已构造就位的古洋壳或裂谷火山岩在古生代随陆壳一起发生大陆深俯冲作用的产物。 相似文献
9.
Cumulative probability functions (CPFs) for large numbers of radiocarbon age determinations are increasingly being used by scientists as a methodology to discern environmental histories. While the recent compilation of regional databases of the radiocarbon dating control for fluvial sediment sequences has been beneficial for identifying gaps in knowledge and stimulating new research, there are a number of problems that critically undermine the use of these CPFs as sensitive hydroclimatic proxies. (i) The CPF method is underpinned by the assumption that each radiocarbon measurement is a true age estimate for a point in time, whereas each measured age in fact forms a scatter around the true age of the sample; (ii) calibration of radiocarbon ages is responsible for much of the structure in CPFs and compounds the problem of scatter and smears the chronological control; (iii) the databases incorporate multiple types of environmental changes differing chronological relationships between the 14C measurements and the dated events, with pre‐dating, dating or post‐dating chronological control each displaying variable length temporal lags all mixed together in the same analysis; and (iv) the radiocarbon ages from individual case studies need to be more robustly tested before being incorporated into regional databases. All these factors negate the value of CPFs as sensitive proxies of environmental change, because peaks in probability for individual radiocarbon measurements are likely to be an incorrect estimate for the age of a geomorphological event and this problem is compounded by combining probabilities for multiple unrelated events. In this paper we present a critical analysis of CPFs and their interpretation before suggesting alternative approaches to analysing radiocarbon geochronologies of geomorphic events, which include: (i) Bayesian age modelling of river terrace development; (ii) developing regional databases that test specific geomorphic hypotheses; (iii) Bayesian age modelling of palaeoflood records; and (iv) analysis of sedimentation rates. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
10.
S.C. Eriksson 《Chemical Geology》1984,46(4):291-299
The Phalaborwa Complex (South Africa) has been dated by UPb analysis of uranothorianite and baddeleyite yielding an age of 2047 + 11/?8 Ma for caronatite and phoscorite magmatism. Baddeleyite yields an age comparable to the age determined on uranothorianite and provides a reliable age indicator. Ages of carbonatite and silicate magmatism cannot be resolved as different events. Confirmation of K-rich alkaline magmas produced in the mantle as early as 2047 Ma suggests that significant chemical heterogeneities existed prior to 2000 Ma. 相似文献
11.
自生伊利石40Ar/39Ar法定年技术及气藏成藏期的确定 总被引：19，自引：1，他引：18
为了确定天然气藏的成藏期,进行了自生伊利石的^40Ar／^39Ar法同位素定年实验．实验重点解决了自生伊利石的^40Ar／^39Ar法定年的几个技术难题：第一,粘土矿物的提纯,避免伊利石以外的含K矿物混入;第二,自生伊利石与碎屑伊利石的分离;第三,克服核反冲造成的Ar原子丢失．利用冷冻一加热循环碎样技术获得高纯度的粘土矿物;通过阶段加热得到的年龄谱可以区分自生伊利石与碎屑伊利石;利用“显微包裹”技术有效克服了核照射反冲问题．对鄂尔多斯盆地北部苏里格气田研究发现。二叠系储层中的伊利石有2种年龄图谱：一种只有自生伊利石的坪年龄;另一种图谱既有自生伊利石的坪年龄,也有碎屑伊利石的年龄,形成二阶式的图谱．通过自生伊利石的形成时间推断,天然气的最早充注时间晚于169～189Ma．实验的结果表明,冷冻加热循环碎样技术可以有效地避免伊利石以外的含K矿物混入．是获得高纯度粘土矿物的关键技术;自生伊利石^40Ar／^39Ar法定年技术可以用于确定天然气藏的成藏期. 相似文献
12.
为油气成烃成藏定量研究,特别为油田剥蚀量的计算,需要建立新生代天文地层年代表。该表的数据是立足于天文学"米氏旋回假说"中地球轨道三要素的周期性和准周期性变化,求出各组(段或亚段)地质年龄。计算方法是选定泌阳凹陷11口井从大仓房组至凤凰镇组的地层分层、测井曲线数据等作频谱分析,寻找响应0.405Myr周期中的最大优势旋回和提出的三个‘基准面'的绝对年龄值。研究和计算的最后成果年龄为:1)大仓房组‘红层'顶/核三4亚段底是以邻近渤海湾盆地东营凹陷沙四下亚段‘红层'顶42.671Ma作为年龄对比和标定,向上计算出核三3亚段底为40.951Ma、核三3～1亚段顶为36.490Ma,核二段的顶为34.845Ma;2)廖庄组底/核一段之间是以邻近渤海湾盆地东营凹陷东营组底32Ma计算的数据作对比和标定,向下计算出核一段底的年龄为34.468Ma,核二段/核一段之间可能为一个大约时长为0.4Myr的小剥蚀面;向上计算廖庄组现有顶平均年龄为26.811Ma,即泌阳凹陷廖庄组全沉积的顶在中新世23.03Ma,地质构造上升和沉积回剥时间平均为3.781Myr;3)平原组底界的年龄标定为目前"国际地层表"(2004)中年龄为2.588Ma,向下计算出凤凰镇组底界平均年龄为4.155Ma。 相似文献
13.
14.
辽西北票蓝旗组火山岩锆石U-Pb年龄和Hf同位素组成 总被引：6，自引：1，他引：5
辽西北票常河营子地区有中生代蓝旗组火山岩分布,其中上部安山质角砾熔岩的锆石LA-ICPMS U-Pb年龄分析结果表明,其结晶年龄为159.4±3.4Ma,属晚侏罗世.锆石~(176)Hf/~(177)Hf比值介于0.282098～0.282789之间,ε_(Hf)(t)值为-20.4～+4.1,主体分布在华北克拉通地壳演化线之上,位于古元古代地壳演化范围内,所给出的亏损地幔年龄(t_(DM))和平均地壳模式年龄(t_(crust))分别为0.7～1.6Ga和0.9～2.5Ga.结合已发表蓝旗组中酸性火山岩的岩石地球化学及Sr-Nd同位素组成特征,我们认为安山质火山岩源于古老(如晚太古代)下地壳玄武质岩石的部分熔融,其形成过程可能与中生代幔源岩浆底侵作用有关. 相似文献
15.
河北大庙铁矿床黑云母40Ar/39Ar年龄及其地质意义 总被引：3，自引：0，他引：3
文章以野外观察为基础确定了致矿侵入体,以岩相学特征确立了测年样品的代表性。在此基础上,选取大庙铁矿大乌素沟矿区浸染状铁矿石中的黑云母进行了40Ar/39Ar年龄测定,坪年龄为(395.8±3.7) Ma,反等时线年龄为(395.6±4.0) Ma(2σ; MSWD=0.9; n=8)。因此,大庙铁矿及其致矿苏长岩的形成年龄约为396 Ma,相当于中泥盆世,而不是前人所认为的元古宙。新的测年结果与区域上近年来陆续识别出来的泥盆纪侵入岩类形成年龄一致,不仅表明华北克拉通的改造过程至少从泥盆纪就已经开始,而且暗示华北克拉通北缘仍有寻找其他“大庙式铁矿”的潜力。同时,文章提出,用成岩年龄作为成矿年龄时,需要有可靠的地质学和岩相学证据。
关键词：大庙式铁矿;斜长岩;苏长岩;40Ar/39Ar定年;成矿年代;华北克拉通 相似文献
16.
The article describes the characteristics of the Yagan metamorphic core complex, especially the associated detachment fault and various extensional structures in its footwall. The age of the complex is discussed in some detail as well. The basic features of the Yagan metamorphic complex (Jurassic in age) are similar to those of the metamorphic core complex (Tertiary in age) in the Cordilleran area; they are as follows: (a) mylonitic gneisses in the footwall, (b) chloritized sheared mylonitic rocks, (c) pseudotachylites and flinty cataclasites or microbreccias, (d) unmetamorphosed or epimetamorphic rocks in the hanging wall with a layer of fault gouges or incohesive fault breccia next to the detachment fault. In contrast to its Cordilleran counterpart, however, there are many extensional faults with different styles (from dactile low-angle normal faults through brittle-ductile to brittle high-angle normal faults)in the footwall. 相似文献
17.
《International Geology Review》2012,54(6):528-538
The Taymyr Neoproterozoic ophiolites are located within the Precambrian accretionary belt, which occurs between the Siberian continent and the Kara continental block. Petrological-geochemical studies suggest that the formation of ophiolites reflects an ensimatic marginal-sea geodynamic environment. Zircon U-Pb dating and Sm-Nd isotopic study suggest a Neoproterozoic age for the plagiogranite from the Chelyuskin ophiolite belt. We regard the zircon U-Pb age (740 Ma) as the upper age boundary for the formation of the ophiolites and the Sm-Nd model age (850 to 785 Ma) as its lower boundary. Data on Sm-Nd, Rb-Sr, Ar-Ar, and K-Ar isotopic systems in garnet amphibolites from the Stanovoy ophiolite belt allowed us to establish the age interval of their metamorphism, ～600 Ma, as the time of obduction of ophiolites and the entire accretionary belt onto the Siberian craton margin. Age data on island-arc volcanics and plagiogranites as well as diabase dikes and sills, traced from the Canadian Cordillera through the Yukon and Franklin belts of North America and further through the Alaska-Chukchi block to Taymyr, may be indicative of the opening of the northern Paleo-Pacific at ～800 Ma. 相似文献
18.
合肥盆地三尖铺组~(40)Ar-~(39)Ar同位素年代地层学研究 总被引：2，自引：0，他引：2
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岩在沉积或成岩作用条件下形成的伊利石之 40 Ar- 39Ar定年 ,其坪年龄为 15 7.7～ 15 9.5 Ma,等时线年龄为 15 7.2～ 15 9.9Ma,并用 K- Ar法测年进行对比和验证 ,其值为 15 1.8～ 15 5 .8Ma,故确定其时代下限应为中侏罗世晚期 (卡洛维期 ) ,上限可能达晚侏罗世早期 (牛津期 )。40 Ar- 39Ar坪年龄谱还记录了晚侏罗世—早白垩世岩浆活动热事件信息 ,以及三尖铺组红层中陆源碎屑之母岩 (云母片岩及片麻岩等 )形成的冷却史。 相似文献
19.
西藏哈海岗钨钼多金属矿床地质特征及辉钼矿铼-锇同位素定年 总被引：2，自引：1，他引：1
西藏墨竹工卡县哈海岗钨钼多金属矿床是近年来新发现的以钨钼为主的多金属矿床,也是念青唐古拉成矿带发现的第一个钨钼多金属矿床。文章简要地介绍了该矿床基本地质特征,利用Re-Os同位素定年方法对采自哈海岗矽卡岩型钨钼矿体中的2件辉钼矿进行了成矿年代的测定,获得的辉钼矿Re-Os同位素模式年龄分别为(140.1±2.8) Ma和(143.3±5.2) Ma,平均值为(141.7±4) Ma。测年数据表明,矿床成矿时代属于早白垩世,可能系班公湖—怒江洋向南俯冲碰撞阶段成矿作用的产物,早于其东侧亚贵拉、洞中拉石英斑岩的成岩年龄(126 Ma左右)。矿床成矿时代的厘定丰富了冈底斯—念青唐古拉成矿带矿床成矿系列,指示冈底斯成矿带存在早白垩世的成矿作用,该带至少存在四期独立的钼成矿事件;同时对于研究区域岩浆演化与成矿作用以及区域找矿预测也具有十分重要的意义。 相似文献
20.
Abstract The article describes the characteristics of the Yagan metamorphic core complex, especially the associated detachment fault and various extensional structures in its footwall. The age of the complex is discussed in some detail as well. The basic features of the Yagan metamorphic complex (Jurassic in age) are similar to those of the metamorphic core complex (Tertiary in age) in the Cordilleran area; they are as follows: (a) mylonitic gneisses in the footwall, (b) chloritized sheared mylonitic rocks, (c) pseudotachylites and flinty cataclasites or microbreccias, (d) unmetamorphosed or epimetamorphic rocks in the hanging wall with a layer of fault gouges or incohesive fault breccia next to the detachment fault. In contrast to its Cordilleran counterpart, however, there are many extensional faults with different styles (from dactile low-angle normal faults through brittle — ductile to brittle high — angle normal faults) in the footwall. 相似文献