|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 天山北部石炭纪埃达克岩-高镁安山岩-富Nb岛弧玄武质岩:对中亚造山带显生宙地壳增生与铜金成矿的意义显示文摘新疆天山北部地区存在有石炭纪的埃达克岩-高镁安山岩-富Nb玄武质岩组合,并且其中许多岩石与铜(金)矿床伴生(如达巴特、阿希、土屋-延东、赤湖,等等)。埃达克岩富钠、高Sr但亏损Y与Yb,无明显Eu-正Eu异常以及正Sr异常与Nb、Ti亏损。高铁安山(闪长)岩是本次研究首次报道的,这些岩石无明显Eu-正Eu异常以及Nb、Ti亏损,普遍具有高的MgO和Cr、Ni含量,其中阿希金矿区一些样品类似于日本西南新生代Setouchi弧火山岩带中的赞岐岩类。富Nb玄武质岩富钠贫钾,具有微弱负-正Ba、Nb和Ti异常以及高的Nb/La比值,不同于大多数正常岛弧玄武岩。天山北部地区石炭纪埃达克岩具有高的ε_(Nd)(t)(+3.4~+9.0)和低的(^(87)Sr/^(86)Sr)_i(0.7032~0.7043)。富Nb玄武质岩具有变化的ε_(Nd)(t)(+3.6~+11.6)和(^(87)Sr/^(86)Sr)_i(0.7007~0.7067)。我们的研究表明,天山北部地区石炭纪埃达克岩-高镁安山岩-富Nb玄武质岩组合可能是“埃达克岩交代的岛弧岩浆岩系列”。埃达克岩最有可能由石炭纪北天山洋的年轻洋壳在俯冲过程中熔融形成。另外,俯冲板片产生的熔体以及所释放的少量流体在上升过程中可能交代地幔楔橄榄岩或与其发生反应:一方面,触发地幔楔橄榄岩发生熔融形成富Nb岛弧玄武质岩;另一方面,地幔组分迅速进入到板片熔体中,导致其地幔组分增加,乃至形成高镁安山岩。因此,天山北部地区石炭纪埃达克岩-高镁安山岩-富Nb玄武质岩组合表明:(1)天山北部地区石炭纪可能为岛孤环境而非裂谷环境;(2)天山地区石炭纪的地壳生长可能以侧向增生为主;(3)除了亏损地幔之外,俯冲洋壳的熔融可能也在地壳的生长中发挥了重要的作用;(4)俯冲板片产生的埃达克质岩浆具有高的氧逸度,而其与地幔楔橄榄岩的强烈相互作用将导致地幔中的金属硫化物分解,成矿金属元素进入到岩浆中。这可能是新疆北部铜金矿化与一些埃达克岩、高镁安山(闪长)岩或富Nb岛弧玄武质岩密切共生的基本原因。 | 王强 赵振华 许继峰 Derek A.WYMAN 熊小林 资峰 白正华 | 2006 | 岩石学报2006，22，1： | 136 |
| 2 | 西准噶尔包古图成矿斑岩年代学与地球化学:岩石成因与构造、铜金成矿意义显示文摘西准噶尔包古图地区的一些小型斑岩体或脉岩与铜金矿化的关系非常密切,引起了人们的广泛关注.报道了一些斑岩的LA-ICP-MS锆石U-Pb定年结果和岩石地球化学成分资料.Ⅱ、Ⅴ岩体的石英闪长斑岩中岩浆结晶锆石的定年结果分别为314.9±1.7Ma和309.9±1.9Ma,Ⅲ岩体的闪长玢岩中岩浆结晶锆石的定年结果为313.9±2.6Ma,表明包古图地区的岩体形成于晚石炭世.包古图地区小岩体的岩石富Na、高Sr,贫Y和Yb,无明显的Eu异常,具有埃达克岩特征,同时有些岩石富集MgO(3.93%~4.78%),具有高的Mg#(68~74),类似高镁安山岩.结合区域地质和岩浆岩的资料,认为:(1)包古图地区的小岩体形成于晚石炭世的岛弧环境,并可能与石炭纪的洋脊俯冲有关,其中埃达克质岩为俯冲洋脊两侧的板片熔融而形成,而高镁闪长岩类为俯冲板片熔体与地幔橄榄岩相互作用的产物;(2)包古图地区的铜金矿床也很可能与洋脊俯冲有关,高氧逸度的板片熔体上升并与地幔橄榄岩相互作用,这使得地幔中的金属硫化物不稳定,释放出金属成矿物质,从而使得Cu、Au等在熔体中不断富集而形成矿床. | 唐功建 王强 赵振华 Derek A.Wyman 陈海红 贾小辉 姜子琦 | 2009 | 地球科学(中国地质大学学报)2009，34，1： | 104 |
| 3 | 西天山达巴特A型花岗岩的形成时代与构造背景显示文摘达巴特花岗斑岩侵入体位于西天山北部的赛里木湖北部,构造上属于准葛尔板块与伊犁-中天山板块之间的造山带。达巴特花岗岩斑岩具有A型花岗岩的特征,如高硅(SiO2=75.38%~77.61%)、碱(Na2O+K2O=8.26%~10.10%)和Fe/(Fe+Mg)(0.91~0.98),但低Al2O3(12.04~12.91%)和CaO(0.03%~0.42%),富集Rb、Th、U等大离子亲石元素和Nb、Ta、Zr、Hf等高场强元素,(Ga/Al)×10^4值变化于3.19~3.40之间,具有明显的负Eu、Ba和Sr异常,稀土配分显示“海鸥型”特征。这巴特花岗岩斑岩具有较高的Rb/Nh和Y/Nb比值,显示了A2型花岗岩的特征。LA—ICP—Ms锆石U—Pb测年结果显示达巴特岩体的侵位年龄为288.9±2.3Ma,并且一些锆石具有老的核(319.0±4.7),暗示花岗岩斑的源岩中可能包含有石炭纪的岩浆岩。结合区域地质和岩浆岩资料,我们认为西天山早二叠世处于伸展的背景中,可能与造山带后碰撞阶段的演化有关。 | 唐功建 陈海红 王强 赵振华 Derek A.Wyman 姜子琦 贾小辉 | 2008 | 岩石学报2008，24，5： | 32 |
| 4 | Mantle plumes,triple junctions and transforms:A reinterpretation of Pacific Cretaceous-Tertiary LIPs and the Laramide connection显示文摘The Shatsky and Hess Rises,the Mid-Pacific Mountains and the Line Islands large igneous provinces(LIPs) present different challenges to conventional plume models.Resolving the genesis of these LIPs is important not only for a more complete understanding of mantle plumes and plume-generated magmatism,but also for establishing the role of subducted LIP conjugates in the evolution of the Laramide orogeny and other circum-Pacific orogenic events,which are related to the development of large porphyry systems.Given past difficulties in developing consistent geodynamic models for these LIPs,it is useful to consider whether viable alternative geodynamic scenarios may be provided by recent concepts such as melt channel networks and channel-associated lineaments,along with the 'two mode'model of melt generation,where a deeply-sourced channel network is superimposed on the plume,evolving and adapting over millions of years.A plume may also interact with transform faults in close proximity to a mid ocean ridge,with the resultant bathymetric character strongly affected by the relative age difference of lithosphere across the fault.Our results suggest that the new two-mode melt models resolve key persistent issues associated with the Shatsky Rise and other LIPs and provide evidence for the existence of a conduit system within plumes that feed deeply-sourced material to the plume head,with flow maintained over considerable distances.The conduit system eventually breaks down during plume-ridge separation and may do so prior to the plume head being freed from the triple junction or spreading ridge.There is evidence for not only plume head capture by a triple junction but also for substantial deformation of the plume stem as the distance between the stem and anchored plume head increases.The evidence suggests that young transforms can serve as pathways for plume material migration,at least in certain plume head-transform configurations.A fortuitous similarity between the path of the Shatsky and Sio plumes,with respect to young spreading ridges and transforms,helps to clarify previously problematic bathymetric features that were not readily ascribed to fixed plumes alone.The Line Island Chain,which has been the subject of a vast number of models,is related mainly to several plumes that passed beneath the same region of oceanic crust,a relatively rare event that has resulted in LIP formation rather than a regular seamount track.Our findings have important implications for the timing and mechanism for the Laramide Orogeny in North America,demonstrating that the Hess Rise conjugate may be much smaller than traditionally thought.The Mid Pacific Mountains conjugate may not exist at all,given large parts of these LIPs were formed at an ‘off-ridge’ site.This needs to be taken into account while considering the effects of conjugate collision on mineralization and orogenic events. | Michael Fletcher Derek A.Wyman Sabin Zahirovic | 2020 | Geoscience Frontiers2020，11，4： | 1 |
| 5 | Eocene Crustal Thickening and Uplifting of the Tibetan Plateau:Evidence from Adakitic Volcanic Rocks显示文摘Changes in oceanic O-Sr-C isotopic compositions, global cooling and Asian continental aridification beginning in the Middle-Late Eocene(47-34 Ma) are considered to have been caused by the uplift of the Tibetan plateau.The specific timing and uplift mechanism,however,have long been subjects of debate.We investigated the Duogecuoren lavas of the central-western Qiangtang block,which form the largest outcrops among Cenozoic lavas in north- | Derek A.Wyman | 2009 | 地学前缘2009，16，S1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员