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| 1 | Episodic crustal anatexis and the formation of Paiku composite leucogranitic pluton in the Malashan Gneiss Dome, Southern Tibet显示文摘The Paiku composite leucogranitic pluton in the Malashan gneiss dome within the Tethyan Himalaya consists of tourmaline leucogranite,two-mica granite and garnet-bearing leucogranite.Zircon U-Pb dating yields that(1)tourmaline leucogranite formed at28.2±0.5 Ma and its source rock experienced simultaneous metamorphism and anatexis at 33.6±0.6 Ma;(2)two-mica granite formed at 19.8±0.5 Ma;(3)both types of leucogranite contain inherited zircon grains with an age peak at^480 Ma.These leucogranites show distinct geochemistry in major and trace elements as well as in Sr-Nd-Hf isotope compositions.As compared to the two-mica granites,the tourmaline ones have higher initial Sr and zircon Hf isotope compositions,indicating that they were derived from different source rocks combined with different melting reactions.Combined with available literature data,it is suggested that anatexis at^35 Ma along the Himalayan orogenic belt might have triggered the initial movement of the Southern Tibetan Detachment System(STDS),and led to the tectonic transition from compressive shortening to extension.Such a tectonic transition could be a dominant factor that initiates large scale decompressional melting of fertile high-grade metapelites along the Himalayan orogenic belt.Crustal anatexis at^28 Ma and^20 Ma represent large-scale melting reactions associated with the movement of the STDS. | GAO LiE ZENG LingSen HOU KeJun GUO ChunLi TANG SuoHan XIE KeJia HU GuYue WANG Li | 2013 | Chinese Science Bulletin2013，58，28： | 23 |
| 2 | Geochronology of the Hannan intrusive complex to adjoin the Qinling orogen and its rapid cooling reason显示文摘The geochronological works for the Hannan intrusive complex, cosisting of the gabbro-quartz dio-rite-plagiogranite bodies, in the north border of the Yangtze craton block, adjoining the Qinling orogen, are reported, because its age and genesis are of great importance to research of the tectonic evalutional history for the Qinling orogen and of the rifted processes for the Late Proterozoic supercontinent Rodinia. A good isochron of t=(837±26) Ma (2σ), corresponding to INd=0.51165±2(2σ), εNd(t)=+1.9, MSWD1.02, was difined by the Nd isotopic analytical results for the 21 whole-rock samples from the varied lithological complex bodies, but for the Rb-Sr isotopic aralytical data there is no isochron. The 40Ar/39Ar plateau age of the biotite, sorted from plagiogranites, is (796±20) Ma(2σ), and yet for the Rb-Sr isotopic data of the plagiogranite whole-rock samples (WR) and the sorted biotite (Bio), plagioclase (Plag) and apatite (Apt) mineral samples from the plagiogranitewhole-rock samples, an | ZHANG Zongqing ZHANG Guowei TANG Suohan ZHANG Qiaoda WANG Jinhui | 2001 | Chinese Science Bulletin2001，46，8： | 10 |
| 3 | Investigation of matrix effects in the MC-ICP-MS induced by Nb, W, and Cu: Isotopic case studies of iron and copper显示文摘Some elements normally occur at trace levels while the majority of natural geological materials may be exceedingly enriched in some special cases, such as the Bayan Obo ore deposit where REE and Nb are extremely enriched. These elements may not be removed completely during purification. Therefore, matrix effects will be caused during stable isotope ratio measurement in the MC-ICP-MS. Experiments have shown that the established methods of chromatographic separation of Cu, Fe, and Zn using AG MP-1 Anion Exchange Resin cannot make ef-fective separation of Nb, W, and Cu from Fe using 20 mL 6 M HCl. It is also observed that the elution curves of W and Cu overlap at working conditions and thus W is present in measurable amounts in some sample solutions. Matrix effects in the MC-ICP-MS induced by Nb, W, and Cu during Fe isotope ratio measurements and by W during Cu isotope ratio measurements were thus investigated by examining their changes in delta values between doped and undoped standards. The results show that the effects of the matrix elements Nb, W, or Cu on Fe isotope ratio measurements are minimal in the case of m(Nb)/m(Fe)<0.005, m(W)/m(Fe)<0.01, or m(Cu)/m(Fe)<0.6. This finding, combined with the extremely low levels of W and Cu, and the fact that nearly 90% of Nb can be removed during purification, demonstrates that the methods of chromatographic separation of Fe established before are suitable for Bayan Obo ore samples and that the methods can be simplified when Cu elution is unnecessary. The effects of the matrix element W on Cu isotope determinations are minimal in the case of m(W)/m(Cu)<0.7. Therefore, W exerts no significant effect on the measurements of Cu isotopes for the majority of natural geological materials. | SUN Jian ZHU Xiangkun TANG Suohan CHEN Yuelong | 2013 | Chinese Journal Of Geochemistry2013，32，1： | 5 |
| 4 | Assessment of Different Digestion Procedures for Mo Isotope Measurements of Black and Grey Shales Using the Double Spike Technique显示文摘This study investigates the behavior of Mo and Mo isotopes (δ^(98)Mo) in shales following leaching with HCl and HNO_(3) with the aim of simplifying the shale dissolution procedure.Up to 6%of the Mo was lost and the Mo isotopes were unaffected when shales were leached using 9 M HCl after ashing.Bulk sample digestion or leaching by 4 M or more concentrated HCl after ashing were all found to be acceptable and reliable approaches to the analysis of Mo isotopes in shales.After black shale (CAGS-BS) was leached with 2 M HCl,1 M HCl,and 9 M HNO_(3),the Mo concentration ([Mo]) in the leachate was lower and δ^(98)Mo was heavier than that obtained from bulk digestion.A Mo isotope mass-balance model showed that the δ^(98)Mo in the residues was lighter than the δ^(98)Mo from the bulk digestion of CAGS-BS and of crustal igneous rocks.No more Mo was lost,nor did Mo isotope fractionation,if the double spike was added before rather than after ashing and followed by bulk digestion or leaching with 9 M HCl.For efficiency,leaching using 4 M or more concentrated HCl after ashing is preferred for Mo isotope measurements. | Jin Li Xiangkun Zhu Suohan Tang | 2022 | Journal of Earth Science2022，33，1： | 1 |
| 5 | High-pressure melting of metapelite and the formation of Ca-rich granitic melts in the Namche Barwa Massif, southern Tibet显示文摘 | Lingsen Zeng Li-E Gao Chunyan Dong Suohan Tang | 2011 | Gondwana Research2011，，1： | 1 |
| 6 | Titanium Isotope Analysis of Igneous Reference Materials using a Double-spike MC-ICP-MS Method显示文摘Ti separation was achieved by ion-exchange chromatography using Bio-Rad AG 1-X8 anion-exchange and DGA resins.For high-Fe/Ti and high-Mg/Ti igneous samples,a three-column procedure was required,whereas a two-column procedure was used for low-Fe/Ti and low-Mg/Ti igneous samples.The Ti isotopes were analysed by MC-ICP-MS,and instrumental mass bias was corrected using a ^(47)Ti-^(49)Ti double-spike technique.The ^(47)Ti-^(49)Ti double-spike and SRM 3162a were calibrated using SRM 979-Cr,certificated value ^(53)Cr/^(52)Crt rue=0.11339.Isobaric interference was evaluated by analysing Alfa-Ti doped with Na,Mg,Ca,and Mo,and results indicate that high concentrations of Na and Mg have no significant effect on Ti isotope analyses;however,Ca and Mo interferences lead to erroneousδ^(49/47)Ti values when Ca/Ti and Mo/Ti ratios exceed 0.01 and 0.1,respectively.Titanium isotopic compositions were determined for 12 igneous reference materials,BCR-2,BHVO-2,GBW07105,AGV-1,AGV-2,W-2,GBW07123,GBW07126,GBW07127,GBW07101,JP-1,and DTS-2b.Samples yieldδ^(49/47)Ti(‰)of−0.035±0.022,−0.038±0.031,0.031±0.022,0.059±0.038,0.044±0.037,0.000±0.015,0.154±0.044,−0.044±0.018,0.010±0.022,0.064±0.043,0.169±0.034,and−0.047±0.025(relative to OL-Ti,±2SD),respectively;of which isotopic compositions of DTS-2b,JP-1,GBW07101,GBW07105,GBW07123,GBW07126,and GBW07127 are reported for the first time.Standard Alfa-Ti was analysed repeatedly over a ten-month period,indicating a reproducibility of±0.047(2SD)forδ^(49/47)Ti,similar to the precisions obtained for geochemical reference materials. | LI Jin TANG Suohan ZHU Xiangkun MA Jianxiong ZHAO Xinmiao | 2022 | Acta Geologica Sinica(English Edition)2022，96，2： | 0 |
| 7 | Iron Isotope Compositions of Natural River and Lake Samples in the Karst Area,Guizhou Province,Southwest China显示文摘为了更好理解天赋的 Fe 同位素特征,在石灰岩地区常见的地形区域取样,河流的推迟的微粒的 Fe 同位素作文,湖推迟了微粒,湖沉积, porewaters ,浮游植物,并且在湖啊哈(一个使矿物化的水系统)和洪芬湖(一个 mesotrophic 水系统)的分水岭的喷雾器,位于石灰岩地区常见的地形区域,西南中国,被调查。学习样品显示了在 56Fe=2.03 之间的一个可变范围并且 0.36。喷雾器和浮游植物相对火的岩石的一般水准有类似或稍微更重的 Fe 同位素作文。河流的推迟的微粒物质(SPM ) 的 Fe 同位素作文被支流的类型主要影响。从严重与煤矿排水污染的支流收集的推迟的微粒在夏天期间显示了否定 56Fe 价值(0.89 ~ 0.31 ) ,并且有在冬季的 56Fe 价值的重要增加,它与两煤矿排水和污水自河被弄脏,除了 AR2。湖的特征在推迟的微粒,湖沉积,和 porewaters 的 Fe 同位素作文上有重要影响。当更轻的 Fe 同位素作文从湖啊哈为微粒 Fe 被测量时,洪芬湖的 epilimnetic 微粒 Fe 有 56Fe=0.04 到 0.13,从 0.42 ~ 0.09 。从洪芬湖的吴厚(HW ) 车站收集的沉积有 0.09 的平均 56Fe 价值,从 0.57 ~ 0.31 并且他们的相应 porewaters 有更轻的 Fe 同位素作文;没有重要变化被观察了。为湖啊哈的梁·强·考(LJK ) 车站,反应 Fe 的内容和硫酸盐的集中都高。由于再循环的反应 Fe,包括 dissimilatory Fe 减小,吸附,和 Fesulfide 形成, porewaters 近取样了沉积表面被发现了有象 2.03 一样低的 56Fe 价值和增加直到 0.12,与 10 厘米的埋葬深度。相反,一个相反的变化趋势被作出对有利的裁决 LJK 沉积。在 1 厘米的深度取样的沉积有 56Fe=0.59 和与埋葬深度象 1.75 一样低的减少的价值。这调查证明重要 Fe 同位素分别发生在表面环境。微粒 Fe 的 Fe 同位素作文被 Fe 来源严重影响,并且再循环的 Fe biogeochemical 在湖沉积在 Fe 同位素分别上有重要影响,特别当有反应 Fe 和硫酸盐的重要数量时。 | SONG Liuting LIU Congqiang WANG Zhongliang ZHU Xiangkun TENG Yanguo WANG Jinsheng TANG Suohan LI Jin LIANG Lili | 2011 | Acta Geologica Sinica(English Edition)2011，85，3： | 0 |
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