李建威
大规模成矿作用及其地球动力学背景、稀有气体同位素地球化学及其对矿床成因的启示、干旱-半干旱地区及热带-亚热带地区风化壳和次生矿床40Ar/39Ar年代学及其古气候意义、埃达克质火成岩及有关铜金矿床成因、化学风化及地貌演化过程中的(U-Th)/He同位素体系等
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- 姓名:李建威
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学术头衔:
博士生导师, 优秀教师/优秀教育工作者
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学科领域:
矿物学(包括放射性矿物学)
- 研究兴趣:大规模成矿作用及其地球动力学背景、稀有气体同位素地球化学及其对矿床成因的启示、干旱-半干旱地区及热带-亚热带地区风化壳和次生矿床40Ar/39Ar年代学及其古气候意义、埃达克质火成岩及有关铜金矿床成因、化学风化及地貌演化过程中的(U-Th)/He同位素体系等
李建威,男,1970年9月出生,博士,教授,博士生导师。1998年毕业于中国地质大学研究生院,获矿产普查与勘探博士学位。1998年7月起在中国地质大学资源学院从事教学和科研工作,现兼任资源科学与工程系主任、地质过程与矿产资源国家重点实验室第三分室主任、湖北省青年科学技术协会副会长。多次前往香港大学、澳大利亚昆士兰大学和墨尔本大学从事科研合作和访问进修。2000年晋升为副教授,2003年破格晋升为教授,入选教育部优秀青年教师资助计划。2004年被遴选为博士生导师,入选教育部“壳幔交换动力学”创新团队(团队学术带头人为高山教授)发展计划。主要研究方向和研究兴趣集中在大规模成矿作用及其地球动力学背景、稀有气体同位素地球化学及其对矿床成因的启示、干旱-半干旱地区及热带-亚热带地区风化壳和次生矿床40Ar/39Ar年代学及其古气候意义、埃达克质火成岩及有关铜金矿床成因、化学风化及地貌演化过程中的(U-Th)/He同位素体系等。负责或参加了国家自然科学基金重点项目、国家自然科学基金面上项目、973项目、教育部优秀青年教师资助计划项目、教育部留学回国人员科研基金、香港RGC项目、澳大利亚ARC项目、国家自然科学基金国际合作项目等10余项。在国内率先开展对华南典型红土型风化壳和次生锰矿床的年代学研究,首次获得我国氧化锰矿床的同位素年龄,为讨论锰矿床的次生富集过程及华南新生代古气候演变和地貌形成与演化提供了关键的年代学资料。在国内外主要学术刊物上发表论文近40篇。
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【期刊论文】锰氧化物的氩去气行为:来自40Ar/39Ar激光阶段加热分析的证据
李建威, 李建威①, P.M.Vasconcelos②, 张均①
,-0001,():
-1年11月30日
采用40Ar/39Ar激光阶段加热分析技术,对采自澳大利亚昆士兰中部某风化剖面中的钡硬锰矿和隐钾锰矿进行同位素年龄测定,获得可靠的坪年龄和等时线年龄,再次证明可以用40Ar/39Ar测年技术对极细小的表生锰氧化物进行年代学研究。发现Ar同位素在钡硬锰矿和隐钾锰矿中主要赋存于两种不同的位置。第1种位置(晶间空隙)主要赋存大气成因Ar,在激光功率为0.2~0.4W时释放出来,包括40Aratm, 38Aratmt和Aratm.第2种位置(即隧道结构或晶内位置)主要赋存放射性成因Ar(40Ar*)和核反应成因Ar (39Ark,38Ark),其去气的激光功率主要在0.5~1.0W之间。当激光功率大于1.0W时,已很少有Ar气从锰氧化物中释放出来,说明赋存放射性成因和核反应成因Ar的隧道结构因持续受热而崩塌、解体。40Ar*,39Ark和38Ark的近于完全一致的去气行为意味着它们不仅在锰氧化物中占有相同或相当的晶体位置,同时证明39Ark在样品接受同位素分析之前的中子照射及实验室预热过程中没有反冲出矿物晶体结构。结果表明,尽管表生锰氧化物中含有大理的大气Ar,且这些氧化物的晶体十分细小,但应用40Ar/39Ar激光阶段加热分析技术可以获得有意义的风化年代学信息。
钡硬锰矿,, 陷钾锰矿,, 40Ar/, 39Ar,, 激光阶段加热分析,, Ar去气
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【期刊论文】表生钾锰矿物40Ar/39Ar年代学及其古气候意义
李建威, 颜代蓉, P. M. VASCONCELOS, N. S. DUZGORENAYDIN, 胡明安, 陈木宏
Earth Science Frontiers (China University of Geosciences, Beijing), 2004 (2): 589~598,-0001,():
-1年11月30日
红土型风化壳和次生锰矿床形成于温暖和潮湿的古气候条件,其中含有丰富的表生钾锰矿物。因此,对表生钾锰矿物进行精确的40Ar/39Ar年龄测定,不仅能查明大陆化学风化和矿床次生富集的时间和过程,而且可以为区域古气候的反演提供重要的年代学资料。透射电子显微镜、热重分析、离子交换实验和40Ar/39Ar同位素分析表明,层状结构的黑锌锰矿、锂锰矿和钠水锰矿以及具有1×1隧道结构的软锰矿不适合于40Ar/39Ar年龄测定;而隐钾锰矿、锰钡矿和锰铅矿因具有致密和稳定的2×2隧道结构及很强的保存K2Ar体系的能力,是40Ar/39Ar同位素定年的理想对象。硬锰矿和钙锰矿分别具有2×3和3×3隧道结构,由于隧道孔径过大,晶体结构的稳定性较差,其作为40Ar/39Ar测年的适用性有待于进一步证实。采用精细的激光阶段加热技术,可以有效克服表生钾锰矿物40Ar/39Ar测年过程中39ArK的反冲损失、多世代表生钾锰矿物的共生,以及表生钾锰矿物中原生矿物的污染和过量大气氩的存在等问题,并获得有意义的风化年龄。已有数据表明,表生钾锰矿物的形成主要集中在白垩纪末期、始新世末期—渐新世早期、中新世和上新世中期等4个时期,可能记录了地史时期周期性的化学风化及气候的交替演变。
表生钾锰矿物, 40Ar/, 39Ar年代学, 古气候, 大陆化学风化, 矿床次生富集
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李建威, Jian-Wei Li a, b, Mei-Fu Zhou b, *, Xian-Fu Li c, Zhao-Ren Fu a, Zi-Jin Li a
Journal of Geodynamics 32(2001)333-354,-0001,():
-1年11月30日
The NNE-trending Hunan-Jiangxi strike-slip fault system (HJSFS) of southern China comprises three NNE-trending primary faults (the Anhua-Chengbu fault, the Chalin-Chenxian fault, and the Ganjiang fault) with associated NE-and NW-trending secondary faults. A series of linear Bouguer gravity lows coincide with these NNE-trending faults and their associated secondary ones. En echelon basins and ranges occurring at fairly regular intervals of 20-40km are strictly situated along the NE-and NNE-trending faults and within their releasing and restraining bends or stepovers, respectively. Several large streams, in general, follow the strike-slip faults. These features demonstrate a close relationship between the modern landforms and the HJSFS. Sub-linear seismically active zones and hot springs are also distributed along or adjacent to the faults, indicating this strike slip fault system is still active. The spatial and temporal relationships between the strike-slip faults and Mesozoic granitic rocks suggest that these faults acted as the loci for magmatic activity at that time. The deformed fold axes, together with the structural framework of the HJSFS itself, indicate a clockwise sub-vertical rotation of large-scale blocks restricted by the primary strike-slip faults. A variety of structural evidence suggests that the HJSFS experienced three deformation stages, i.e. transpression, transtension and compression. On the basis of offsets of pre-Late Triassic lithofacies, Mesozoic granites, and the Late Silurian suture zone between the Yangtze and Cathaysia Blocks, the total sinistral displacement of the HJSFS is estimated to be 50-60km. The HJSFS is comparable to the Tan-Lu fault with respect to the fault geometry and evolution history. However, the HJSFS has a different structural style, displacement and earthquake intensities from those of the central segment of the Tan-Lu fault, resulting from the differences in crustal structures of the North China Block and South China Block.
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李建威, LI Jianwei, , ZHOU Meifu, LI Xianfu, FU Zhaoren & LI Zijin
SCIENCE IN CHINA (Series D) 2002, 45 (9): 851~864,-0001,():
-1年11月30日
South China is the most important uranium producer in the country. Much of the Mesozoic-Cenozoic geology of this area was dominated by NNE-trending intracontinental strike-slip faulting that resulted from oblique subduction of the paleo-Pacific plate underneath the eastern China continent. This strike-slip fault system was characterized by transpression in the early-mid Jurassic and by transtension from the latest Jurassic through Cretaceous to early Tertiary. Most uranium ore deposits in South China are strictly fault-hosted and associated with mid-late Mesozoic granitic intrusions and volcanic rocks, which formed under transpression and transtension regimes, respectively. Various data demonstrate that the NNE-trending strike-slip faults have played critical roles in the formation and distribution of hydrothermal uranium deposits. Extensive geochronological studies show that a majority of uranium deposits in South China formed during the time period of 140 40 Ma with peak ages between 87 48 Ma, coinciding well with the time interval of transtension. However, hydrothermal uranium deposits are not uniformly distributed along individual strike-slip fault. The most important ore-hosting segments are pull-apart stepovers, splay structures, extensional strike-slip duplexes, releasing bends and fault intersections. This non-uniform distribution of ore occurrences in individual fault zone reflects localization of hydrothermal fluids within those segments that were highly dilational and thus extremely permeable. The unique geometric patterns and structural styles of strike-slip faults may have facilitated mixing of deeply derived and near-surface fluids, as evidenced by stable isotopic data from many uranium deposits in South China. The identification of fault segments favorable for uranium mineralization in South China is important for understanding the genesis of hydrothermal ore deposits within continental strike-slip faults, and therefore has great implications for exploration strategies.
strike-slip fault,, transtension,, fluid flow,, uranium deposits,, South China.,
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李建威, Jian-Wei Li
Mineralium Deposita (2002) 37: 213-225,-0001,():
-1年11月30日
The early Tertiary Sanerlin uranium deposit is located near the southwestern margin of the Chaling- Yongxing pull-apart basin defined by the Chaling-Yongxing and Chenxian-Linwu sinistral strike-slip faults in southern China. The uranium ores are hosted in 15 breccia-veinbodies, which are separately located in the cores of three secondary anticlines of the Upper Permian Dangchong Formation. Individual breccia-vein bodies are composed of fragments of silicified shale and sandstone from the Dangchong Formation, and quartz veinlets as cements. These fragments, together with quartz veins, form a mosaic texture. Hydrothermal pitchblende is the only commercial uranium mineral, mainly occurring as disseminated grains within quartz veins or coating fragments. Other metallic minerals include molybdenite, pyrite, chalcopyrite, galena, sphalerite, and red microcrystalline hematite. Fluid inclusions in quartz veins have homogenization temperatures ranging from 150 to 280 C, and calculated salinity values between 5.6 and 13.4wt% NaCl equivalent. Stable isotope analyses show that the mineralizing fluid was characterized by d18O values of-2.2 to +2.6 & and dDH2O values of-134 to-110 &. These analytical data demonstrate that hydrothermal fluids were mainly derived from formation waters (brines) of the Chaling-Yongxing basin. Fluid overpressuring was caused by an abnormal geothermal gradient and impermeable shales inthe deposit area. The geometry, texture, and structure of the breccia-veinsystem, along with the fluid pressure estimates, suggest that hydraulic fracturing generated the mineralized breccia-vein system. Pitchblende and associated minerals were deposited when gaseous phases were released abruptly from the ore fluids due to the hydraulic fracturing.
Sanerlin uranium deposit
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李建威
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-1年11月30日
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李建威
,-0001,():
-1年11月30日
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李建威, Jian-Wei Li a, b, Paulo Vasconcelos b*
Earth and Planetary Science Letters 200 (2002) 223-239,-0001,():
-1年11月30日
One hundred and twenty-five mineral grains from 45 visually pure K-bearing Mn oxide (hollandite group) samples collected from weathering profiles in the Mt Tabor region of central Queensland, Australia, were analysed by the 40Ar/39Ar laser probe technique. These K-Mn oxides precipitated mainly through a process of cavity filling (direct precipitation from weathering solution), with botryoidal texture formed by micrometric mineral bands. Well-defined and reproducible plateau ages have been obtained for most samples, ranging from 27.2
hollandite, cryptomelane, Ar-40/, Ar-39, weathering, paleoclimatology, Miocene, Queensland Australia
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李建威, LI Jianwei, P. M. Vasconcelos & ZHANG Jun
Chinese Science Bulletin Vol. 47 No.18 September 2002,-0001,():
-1年11月30日
Manganese oxides in association with paleoweathering may provide significant insights into the multiple factors affecting the formation and evolution of weathering profiles, such as temperature, precipitation, and biodiversity. Laser probe step-heating analysis of supergene hollandite and cryptomelane samples collected from central Queensland, Australia, yield well-defined plateaus and consistent isochron ages, confirming the feasibility dating very-fined supergene manganese oxides by 40Ar/39Ar technique. Two distinct structural sites hosting Ar isotopes can be identified in light of their degassing behaviors obtained by incremental heating analyses. The first site, releasing its gas fraction at the laser power 0.2 0.4W, yields primarily 40Aratm, 38Aratm, and 36Aratm (atmospheric Ar isotopes). The second sites yield predominantly 40Ar* (radiogenic 40Ar), 39ArK, and 38ArK (nucleogenic components), at 0.5 1.0W. There is no significant Ar gas released at the laser power higher than 1.0W, indicating the breakdown of the tunnel sites hosting the radiogenic and nucleogenic components. The excellent match between the degassing behaviors of 40Ar*, 39ArK, and 38ArK suggests that these isotopes occupy the same crystallographic sites and that 39ArK loss from the tunnel site by recoil during neutron irradiation and/or bake-out procedure preceding isotopic analysis does not occur. Present investigation supports that neither the overwhelming atmospheric 40Ar nor the very-fined nature of the supergene manganese oxides poses problems in extracting meaningful weathering geochronological information by analyzing supergene manganese oxides minerals.
hollandite,, cryptomelane,, 40Ar/, 39Ar laser incremental heating,, argon degassing,, tunnel site.,
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【期刊论文】Alkaline syenites in eastern Cathaysia (South China): link to Permian-Triassic transtension
李建威, Qiang Wang a, *, Jian-Wei Li b, Ping Jian c, Zhen-Hua Zhao a, Xiao-Lin Xiong a, Zhi-Wei Bao a, Ji-Feng Xu a, Chao-Feng Li d, Jin-Long Ma a
Earth and Planetary Science Letters 230 (2005) 339-354,-0001,():
-1年11月30日
Two alkaline syenite plutons, the Tieshan and Yangfang plutons, have recently been recognized within NE-trending fault zones in eastern Cathaysia, South China. The rocks are very enriched in K2O (6.28-9.39wt.%), rare earth elements (REE; particularly light REE) and large ion lithophile elements, but are relatively low in high field strength elements. Isotopically, they are characterized by high initial 87Sr/86Sr (0.7093 to 0.7123) and low eNd(t) values (5.64 to 10.63). The geochemical data suggest that the alkaline syenites most likely formed via fractional crystallization of enriched mantle-derived magmas. Sensitive High-Resolution Ion Microprobe zircon U-Pb dating indicates that these two intrusions have Late Permian (254F4Ma) and Early Triassic (242F4Ma) crystallization ages, respectively. Our data suggest that a tectonic regime dominated by transtension probably existed from at least the latest Permian into the Triassic and was responsible for the formation of the Tieshan and Yangfang alkaline syenites. When combined with previous paleomagnetic, structural, and sedimentology data, we suggest that the transtension along the NE-trending strike-slip fault zones was related to oblique subduction of the Pacific plate underneath South China.
Late Permian and Early Triassic, alkaline syenite, transtension, Cathaysia, South China
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