Age, provenance and tectonic setting of Neoproterozoic to early Paleozoic sequences in southeastern South China Block: Constraints on its linkage to western Australia-East Antarctica
Age, provenance and tectonic setting of Neoproterozoic to early Paleozoic sequences in southeastern South China Block: Constraints on its linkage to western Australia-East Antarctica
复制标题
华南地块东南部新元古代至早古生代层序的时代、物源及构造背景：其与澳大利亚西部-南极洲东部联系的制约因素
DOI：
10.1016/j.precamres.2017.03.002
复制
发表时间：
2017-03
影响因子：
3.8
通讯作者：
Lan Zu-Fan
中科院分区：
文献类型：
--
作者：
Wang Wei;Zeng Min-Fang;Zhou Mei-Fu;Zhao Jun-Hong;Zheng Jian-Ping;Lan Zu-Fan
利用锆石U-Pb-Hf同位素和全岩地球化学资料，对华南华夏地块晚新元古代及其上覆层序的形成时代、物源和构造环境进行了研究，以了解该地块的构造演化及其与超大陆的联系。新的锆石U-Pb年龄结合前人的化石资料表明，楼子坝群下、上群的沉积时代分别为655 ~ 635 Ma（寒武纪）和635 ~ 542 Ma（埃迪卡拉纪）。楼子坝砂岩的低CIA（65-57）和高ICV（1.64-1.05）值表明，未成熟沉积物在其源区经历了轻度至弱的化学风化。早古生代砂岩具有较高的CIA（80-69）和较低的ICV（0.95-0.84）值，表明具有强烈化学风化的成熟沉积物。尽管化学风化程度不同，但所有沉积物样品的TiO 2与Al 2 O3呈正相关，（La/Yb）n与Zr呈负相关，而（La/Yb）n与P2 O 5无相关性。这些数据表明，耐矿物质，如金红石，独居石和锆石的分选，并没有影响采样碎屑的化学特征。因此，地球化学特征，结合碎屑岩年龄谱，表明楼子坝群和上覆层序记录了碰撞和被动环境下的沉积作用，碎屑主要来源于中长英质火成岩（约1300 -1000 Ma）楼子坝群下部的碎屑可能主要来自风车岛-邦格山（1300-1050 Ma）和Albany-Fraser带-Musgrave（1300-1050 Ma）。在最上部的楼子坝群中，新元古代早期（约990-950 Ma）碎屑的输入量增加，表明东高止山脉（约1000 Ma）的贡献更大。990-950 Ma）在印度东部和北查尔斯王子山脉（约。990-950 Ma）。这一物源变化与冈瓦纳大陆拼合过程中的Kuunga造山带（560-530 Ma）和Pinjarra造山带（560-520 Ma）的形成是同步的。楼子坝群最上部的黄连组沉积物可能记录了这一事件。上覆的古生代层序则沉积在被动边缘上，碎屑主要来自新元古代早期的物源，例如，东印度和东南极洲。
Zircon U-Pb-Hf isotopes and whole-rock geochemical data are applied to investigate the age, provenance and tectonic setting of the late Neoproterozoic and overlying sequences from the Cathaysia Block of South China, in order to understand the tectonothermal evolution of this block and its linkage to supercontinents. New zircon U-Pb ages, in combination with previous fossil data, indicate the lower and upper Louziba Groups were deposited between 655 and 635 Ma (Cryogenian) and 635 and 542 Ma (Ediacaran), respectively. Low CIA (65–57) and high ICV (1.64–1.05) values for the Louziba sandstones are suggestive of immature sediments that experienced mild to weak chemical weathering in their source areas. In contrast, early Paleozoic sandstones have higher CIA (80–69) and lower ICV (0.95–0.84) values, indicative of mature sediments with intensive chemical weathering. Despite the different degrees of chemical weathering, all sedimentary samples show positive correlation between TiO2and Al2O3,and negative correlation in plot of (La/Yb)n vs Zr but lack any correlation between (La/Yb)n and P2O5. These data demonstrate sorting of resistant minerals, such as rutile, monazite and zircon, did not affect the chemical signatures of sampled detritus. Consequently, geochemical features, in combination with detrital age spectra, indicate that the Louziba Group and overlying sequences record sedimentation in collisional and passive settings, with the detritus being derived dominantly from intermediate to felsic igneous rocks.Late Mesoproterozoic (ca.1300–1000 Ma) detritus in the lower Louziba Group were probably derived primarily from the Windmill Islands-Bunger Hills (1300–1050 Ma) and Albany-Fraser Belt-Musgrave (1300–1050 Ma) regions in East Antarctica-western Australia. Increasing input of early Neoproterozoic (∼990–950 Ma) detritus in the uppermost Louziba Group indicates a greater contribution from the Eastern Ghats (ca. 990–950 Ma) in eastern India and North Prince Charles Mountains (ca. 990–950 Ma) in East Antarctica. This source change was synchronous with the formation of the Kuunga (560–530 Ma) and Pinjarra (560–520 Ma) Orogens during assembly of Gondwana. The sediments of the Huanglian Formation of the uppermost Louziba Group likely recorded this event. Overlying Paleozoic sequences then were deposited on passive margin with detritus being derived dominantly from an early Neoproterozoic source, e.g., eastern India and East Antarctica.
登录
查看更多内容
影响因子：
4.2
作者：
Y. Chu;Wei Lin;M. Faure;Qingchen Wang
通讯作者：
Y. Chu;Wei Lin;M. Faure;Qingchen Wang
华南武夷山西侧流纹岩的时代及构造环境
DOI：
10.1007/s11430-008-0078-4
发表时间：
2008-07
期刊：
Science in China Series D-Earth Sciences
影响因子：
--
作者：
Wang YanBin;Shu LiangShu;Deng Ping;Yu JinHai;Jiang ShaoYong
通讯作者：
Jiang ShaoYong
影响因子：
2.6
作者：
Chen Xu;D. Rowley;R. Jia-yu;Zhang Jin;Zhang Yuandong;Zhang Ren-bing
通讯作者：
Chen Xu;D. Rowley;R. Jia-yu;Zhang Jin;Zhang Yuandong;Zhang Ren-bing
影响因子：
--
作者：
Jian Wang;Xian‐Hua Li;T. Duan;Dunyi Liu;B. Song;Zhongxiong Li;Yonghua Gao
通讯作者：
Jian Wang;Xian‐Hua Li;T. Duan;Dunyi Liu;B. Song;Zhongxiong Li;Yonghua Gao
影响因子：
3.8
作者：
J. Halpin;N. Daczko;G. Clarke;Kathleen R. Murray
通讯作者：
J. Halpin;N. Daczko;G. Clarke;Kathleen R. Murray