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| 1 | Genesis of the Nanyangtian scheelite deposit in southeastern Yunnan Province,China: evidence from mineral chemistry,fluid inclusions,and C–O isotopes显示文摘The Nanyangtian skarn-type scheelite deposit is an important part of the Laojunshan W–Sn polymetallic metallogenic region in southeastern Yunnan Province,China. The deposit comprises multiple scheelite ore bodies;multilayer skarn-type scheelite ore bodies are dominant,with a small amount of quartz vein-type ore bodies. Skarn minerals include diopside, hedenbergite, grossular, and epidote. Three mineralization stages exist: skarn, quartz–scheelite, and calcite. The homogenization temperatures of fluid inclusions in hydrothermal minerals that formed in different paragenetic phases were measured as follows:221–423℃ (early skarn stage), 177–260℃ (quartz–scheelite stage), and 173–227℃ (late calcite stage). The measured salinity of fluid inclusions ranged from 0.18% to16.34% NaCleqv(skarn stage), 0.35%–7.17% NaCleqv(quartz–scheelite stage), and 0.35%–2.24% NaCleqv(late calcite vein stage). Laser Raman spectroscopic studies on fluid inclusions in the three stages showed H_2O as the main component, with N_2 present in minor amounts. Minor amounts of CH_4 were found in the quartz–scheelite stage. It was observed that the homogenization temperature gradually reduced from the early to the late mineralization stages; moreover, δ^(13)C_(PDB) values for ore-bearing skarn in the mineralization period ranged from -5.7‰ to-6.9‰ and the corresponding δ^(18)O_(SMOW) values ranged from 5.8‰ to 9.1‰, implying that the ore-forming fluid was mainly sourced from magmatic water with a minor amount of meteoric water. Collectively, the evidence indicates that the formation of the Nanyangtian deposit is related to Laojunshan granitic magmatism. | Qianru Cai Yongfeng Yan Guangshu Yang Fuju Jia Chao Li | 2018 | Acta Geochimica2018，37，4： | 2 |
| 2 | Neoproterozoic Crustal Reworking and Growth in the Zhangbaling Uplift, Tan-Lu Fault Zone: Evidence from the Feidong Complex and Zhangbaling Group显示文摘Intensive mid-Neoproterozoic magmatism is the salient feature of the Yangtze Block,preserving abundant information about crustal reworking and growth.Zircon U-Pb-Lu-Hf isotope analysis was performed on material from the Feidong Complex(FDC)and Zhangbaling Group(ZBLG)of the Zhangbaling Uplift,in order to determine the age and magmatic source of the Neoproterozoic igneous rocks as well as the detrital provenance for the sedimentary rocks,to further provide important data for understanding the mid-Neoproterozoic crustal evolution of the Northeast Yangtze Block.The amphibolite and gneissic granites in the Feidong Complex(FDC)gave similar protolith ages of 782-776 Ma.The synmagmatic zircons exhibited variable negativeεHf(t)values of-26.9 to-8.3.Early(ca.2.4 Ga)to late Paleoproterozoic(ca.2.0-1.9 Ga)inherited zircons were found in the gneissic monzogranite,with negativeεHf(t)values of-11.2 to-7.2,indicating strong reworking of the ancient crustal materials of the Northeast Yangtze Block.Whereas the amphibolites represent minor crustal growth through emplacement of continental rifting-related mafic magmas.The quartz-keratophyres in the Xileng Formation of the ZBLG in contrast systematically yield young protolith crystallization ages of 754-727 Ma with highεHf(t)values of-2.0 to+5.6,indicating their derivation from the reworking of juvenile crustal materials.The detrital zircons from the metasiltstone in the Beijiangjun Formation yield variable^(206)Pb/^(238)U ages(871-644 Ma)with a peak age at 741±11 Ma andεHf(t)values of-4.3 to+5.3,which is consistent with those of the Xileng Formation,but distinct from the FDC,indicating that the provenance of the metasiltstone is primarily the underlying Xileng Formation.The mid-Neoproterozoic igneous and sedimentary rocks of the Zhangbaling Uplift were products from continental rifting zones along the northern margin of the Yangtze Block,situated in different positions from the Susong Complex and the Haizhou Group.The transition from ancient to juvenile crustal sources for felsic magmatic rocks is attributed to gradually increased crustal extension during continental rifting. | NIU Manlan CAI Qianru WU Qi YUAN Xiaoyu SUN Yi LI Xiucai LI Chen ZHU Guang LI Zhensheng ZHANG Shuai | 2020 | Acta Geologica Sinica(English Edition)2020，94，6： | 1 |
| 3 | Synthesis of pyrimidines from dinitrogen and carbon显示文摘The element nitrogen and nitrogenous compounds are vital to life.The synthesis of nitrogen-containing compounds using dinitrogen as the nitrogen source,not through ammonia,is of great interest and great value but remains a grand challenge.Herein,we describe a strategy to realize this transformation by combining the heterogeneous approach with the homogeneous methodology.The N_(2)molecule was first fixed with carbon and LiH through a one-pot heterogeneous process,forming Li_(2)CN_(2)as an’activated’nitrogen source with high efficiency.Then subsequent homogeneous treatments of Li_(2)CN_(2)to construct the organic synthon carbodiimide and the RNA/DNA building block pyrimidines were fulfilled.By using^(15)N_(2)as the feedstock,their corresponding^(15)N-labeled carbodiimide and pyrimidines were readily obtained.This homogeneous-heterogeneous synergy strategy will open a new chapter for N_(2)transformation. | Xianghui Shi Qianru Wang Chao Qin Li-Jun Wu Yuanjin Chen Gao-Xiang Wang Yongli Cai Wenbo Gao Teng He Junnian Wei Jianping Guo Ping Chen Zhenfeng Xi | 2022 | National Science Review2022，9，12： | 0 |
| 4 | Tectonic unit divisions based on block tectonics theory in the South China Sea and its adjacent areas显示文摘Identifying distinct tectonic units is key to understanding the geotectonic framework and distribution law of oil and gas resources.The South China Sea and its adjacent areas have undergone complex tectonic evolution processes,and the division of tectonic units is controversial.Guided by block tectonics theory,this study divide the South China Sea and its adjacent areas into several distinguished tectonic units relying on known boundary markers such as sutures(ophiolite belts),subduction-collision zones,orogenic belts,and deep faults.This work suggests that the study area is occupied by nine stable blocks(West Burma Block,Sibumasu Block,LanpingSimao Block,Indochina Block,Yangtze Block,Cathaysian Block,Qiongnan Block,Nansha Block,and Northwest Sulu Block),two suture zones(Majiang suture zone and Southeast Yangtze suture zone),two accretionary zones(Sarawak-Sulu accretionary zone and East Sulawesi accretionary zone),one subduction-collision zone(RakhineJava-Timor subduction-collision zone),one ramp zone(Philippine islands ramp zone),and six small oceanic marginal sea basins(South China Sea Basin,Sulu Sea Basin,Sulawesi Sea Basin,Banda Sea Basin,Makassar Basin,and Andaman Sea Basin).This division reflects the tectonic activities,crustal structural properties,and evolutionary records of each evaluated tectonic unit.It is of great theoretical and practical importance to understand the tectonic framework to support the exploration of oil and gas resources in the South China Sea and its adjacent areas. | Zhengxin Yin Zhourong Cai Cheng Zhang Xiaofeng Huang Qianru Huang Liang Chen | 2021 | Acta Oceanologica Sinica2021，40，9： | 0 |
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