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杨明等-JAAS:LA-SF-ICP-MS准确测定黑钨矿U-Pb年龄(图)
LA-SF-ICP-MS 黑钨矿 U-Pb 年龄
2020/11/11
钨是重要的关键性金属资源之一,广泛用于电器、电子、化工及军事工业等领域。我国钨矿资源丰富,是世界上重要的钨金属资源基地,其中华南地区(赣南-粤北-湘南)是我国钨矿成矿带重要产区。准确限定钨矿床的成矿时代,对于充分了解其矿床成因、精细成矿过程、矿床分布规律以及进一步指导矿床的寻找和勘查均起着至关重要的作用。黑钨矿[(Fe,Mn)WO4]作为钨最主要赋存矿物之一,广泛存在于各类岩浆或热液钨矿床中,对其...
鞍本是华北克拉通最为重要的BIF铁矿集中区之一,BIF赋存于鞍山群表壳岩中.通过对广泛分布的鞍山群表壳岩的12个样品进行锆石SHRIMP U-Pb定年,大都获得2.50~2.55Ga岩浆锆石年龄,一些岩石中存在2.7~3.5Ga碎屑锆石或外来锆石.一些东北部(东部)岩石记录了新太古代晚期-古元古代早期变质锆石年龄.结合前人研究成果,可得出如下结论:(1)鞍本地区广泛分布的鞍山群含BIF表壳岩形成时...
Geochronology, Geochemistry and Sr-Nd-Pb-Hf Isotopes of No. I Complex from the Shitoukengde Ni–Cu Sulfide Deposit in the Eastern Kunlun Orogen, Western China: Implications for the Magmatic Source, Geodynamic Setting and Genesis
Sr-Nd-Pb-Hf isotopes crustal contamination oceanic slab break-off post-collisional extension Shitoukengde Ni-Cu deposit Eastern Kunlun Orogen
2018/4/10
The Shitoukengde Ni-Cu deposit, located in the Eastern Kunlun Orogen, comprises three mafic–ultramafic complexes, with the No. I complex hosting six Ni-Cu orebodies found recently. The deposit is host...
New constraints on shergottite petrogenesis from analysis of Pb isotopic compositional space: Implications for mantle heterogeneity and crustal assimilation on Mars
shergottite Pb isotopes Martian geochemistry crustal assimilation mantle heterogeneity
2017/4/10
Geochemical studies of shergottites (Martian basalts) based on Rb-Sr, Sm-Nd, and Lu-Hf isotopic systematics have
provided clues to understanding the geochemical evolution of the Martian mantle and id...
Paleomagnetic dating of non-sulfide Zn-Pb ores in SW Sardinia (Italy): a first attempt
paleomagnetism non-sulfideores calamine Sardinia
2015/9/10
A first paleomagnetic investigation aimed at constraining the age of the non-sulfide Zn-Pb ore deposits in the
Iglesiente district (SW Sardinia, Italy) was carried out. In these ores, the oxidation o...
本文运用LA-ICP-MS和SIMS对柴北缘超高压变质带中东端沙柳河剖面中的副片麻岩进行了锆石和金红石U-Pb年代和微量元素分析。锆石边部的变质时代为425±6Ma,所对应的锆石Ti含量温度计计算出的温度为689±14℃。金红石U-Pb定年给出的年龄为414.0±6.3Ma,代表了副片麻岩在折返过程中冷却到金红石U-Pb封闭温度约570℃的时代。而金红石Zr含量温度计给出同锆石边部较一致的温度68...
华北克拉通是否同华南克拉通一样保存有与Rodinia超大陆聚合和裂解有关的年龄记录是理解华北克拉通元古宙构造演化的重要科学问题。本文对位于华北克拉通燕辽裂陷槽的北京西山地区的寒武系和侏罗系碎屑岩进行锆石LA-ICP-MS U-Pb年代学研究,目的是通过碎屑锆石年龄揭示华北克拉通前寒武纪尤其是古元古代末-新元古代重要地质事件。定年结果显示,北京西山寒武系徐庄组的钙质细砂岩中碎屑锆石年龄峰值主要集中在...
In situ rutile U–Pb dating by laser ablation-MC-ICPMS
laser ablation MC-ICPMS rutile U–Pb dating in situ
2017/4/11
A method for in situ rutile U–Pb dating was developed using a multiple-collector (MC) ICPMS coupled to an excimer
laser-ablation system. Compared with single collector Quadruple ICPMS used by previou...
Evolution history of the crust underlying Cerro Pampa, Argentine Patagonia: Constraint from LA-ICPMS U–Pb ages for exotic zircons in the Mid-Miocene adakite
eochronological fingerprint zircon adakite LA-ICPMS crustal evolution Cerro Pampa Pa
2017/4/11
This paper newly reports results of LA-ICPMS U–Pb dating for 282 zircon crystals separated from a Middle Miocene
adakite in Cerro Pampa, southern Argentine Patagonia. With the exception of one spot a...
安徽省金寨县沙坪沟斑岩型钼矿位于大别山东段,钼矿化与石英正长斑岩和爆破角砾岩紧密相关。石英正长斑岩和爆破角砾岩LA-ICP-MS锆石U-Pb年龄分别为116.1±2.2Ma和112.9±1.2Ma,侵位于早白垩世。两类岩石都显示出高钾、富碱、富铝的特点,属过铝质A型花岗岩,具有较高浓度的大离子亲石元素和相对低含量的高场强元素以及较低的HREE和Y、Yb含量,暗示其源于石榴石作为残留相的较深层次的下...
东北地区古生代花岗岩分布范围非常广泛,花岗岩研究对反演地壳增生意义重大。虽然如此,东部地区古生代花岗岩的研究仍相对薄弱,需要特别关注。 LA-ICPMS U-Pb 同位素定年结果表明,本研究花岗岩体为晚中生代海西期(262Ma)岩浆活动的产物。锆石的LA-MC-ICPMS Hf 同位素研究结果显示,εHf(t)范围为1.35~5.62,二阶段 Hf 模式年龄(tDM2)范围为1.1~1.4Ga,暗...
榍石原位微区LA-ICPMSU-Pb年龄测定
原位微区U-Pb测年 榍石 单点分析 线扫描分析 基体效应
2013/8/19
利用配有193nmArF准分子激光剥蚀系统的Agilent7500a四极杆电感耦合等离子体质谱仪(Q-ICPMS),分别采用单点和线扫描分析模式对榍石标样BLR-1,OLT-1和锆石标样91500,GJ-1进行了原位微区U-Pb年龄测定.实验结果显示,以榍石BLR-1作为外部标样,单点和线扫描分析所获得榍石OLT-1的206Pb/238U加权平均年龄分别为1015±5Ma(2σ,n=24)和101...
Mixing effects in zircon U–Pb ion microprobe dating: An example from a quartzofeldspathic dyke in the Yeongdeok pluton, southeastern Korea
SHRIMP zircon dating mixing dyke
2017/4/11
A swarm of quartzofeldspathic dykes extensively intruded the Permian–Triassic Yeongdeok pluton and xenoliths therein
in southeastern Korea. Zircons from the dyke intruding a diorite xenolith yield se...