Sedimentary response to volcanic activity in the Okinawa Trough since the last deglaciation
Sedimentary response to volcanic activity in the Okinawa Trough since the last deglaciation
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上次冰消期以来冲绳海槽火山活动的沉积响应
DOI：
10.1007/s00343-010-9272-2
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发表时间：
2010-01
影响因子：
--
通讯作者：
Li Tiegang
中科院分区：
文献类型：
--
作者：
Jiang Fuqing;Li Anchun;Li Tiegang
为探讨火山活动与沉积物记录在区域和时间尺度上的关系，采集了东海陆架至冲绳海槽北方的158个表层沉积物样品，并在冲绳海槽北方和南方各采集了2个岩心。对这些样品的矿物学、粒度和地球化学分析表明：1）火山活动影响沉积物中火山玻璃、火山型辉石、紫苏辉石和磁铁矿增加; 2）灰层中沉积物粒度（和粉砂含量）增加; 3）Na 2 O和Zr含量较高，而陆源元素，如Na 2 O和Zr含量较低。TFe 2 O 3和K 2 O，以及生物成分，例如，CaO和Sr在灰层中相对低于非灰层。火山灰的分布具有明显的3个特征：1）火山灰含量在大洋中脊北方和中部高于南部; 2）火山灰含量从陆架向海槽逐渐增加; 3）近12 000 a来的沉积物表明火山活动比15 000-12 000 a期间强烈。火山口的喷发位置、频率和体积是控制火山灰分布的重要因素。此外，向北延伸的主要黑潮暖流可能阻碍了火山灰在OT西部和南部的扩散。然而，一股向南的气流可能将一些火山灰带到了OT南部。
To investigate the relationship between volcanic activity and sediment record on regional and temporal scales, 158 surface sediment samples were collected from the East China Sea Shelf to the northern Okinawa Trough (OT), and two cores recovered in the northern and southern OT, respectively. Mineralogy, grain-size, and geochemical analyses of those samples show that: 1) volcanic glass, volcanic-type pyroxene, hypersthenes, and magnetite increase in sediment influenced by volcanic activity; 2) sediment grain sizes (and also silt content) increase in ash layers; and 3) the contents of Na2O and Zr are higher, while terrigenous elements, e.g., TFe2O3and K2O, and biogenous compositions, e.g., CaO and Sr, are relatively lower in ash layers than those of non-ash layers. The distribution of volcanic ash has three distinguishing characteristics: 1) volcanic ash is more abundant in the northern and central OT than the southern OT; 2) volcanic ash increases from continental shelf to the trough; 3) the sediment during the last 12 000 a suggests stronger volcanic events than during 15 000–12 000 a. The eruptive locations, frequency, and volume of calderas are among the most important factors controlling the distributions of volcanic ash. In addition, the main Kuroshio warm current that extends northward probably impeded the diffusion of volcanic ash to the west and south in the OT. However, a southward current probably carried some volcanic ash toward southern OT.
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海因里希事件在冲绳海槽的印记：来自氧同位素和浮游有孔虫的证据
DOI：
10.1016/s0031-0182(01)00332-7
发表时间：
2001-12
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
Tiegang Li;Zhenxia Liu;Michael A. et al
通讯作者：
Michael A. et al
影响因子：
--
作者：
J. Sibuet;J. Letouzey;Fl Barbier;J. Charvet;J. Foucher;T. Hilde;M. Kimura;L. Chiao;B. Marsset-B.
通讯作者：
J. Sibuet;J. Letouzey;Fl Barbier;J. Charvet;J. Foucher;T. Hilde;M. Kimura;L. Chiao;B. Marsset-B.
影响因子：
2.9
作者：
Myong-ho Park;Ilsoo Kim;Jae-Bong Shin
通讯作者：
Myong-ho Park;Ilsoo Kim;Jae-Bong Shin
影响因子：
5.3
作者：
Jian, ZM;Wang, PX;Cheng, XR
通讯作者：
Cheng, XR
影响因子：
2.9
作者：
Xuedong Xu;M. Oda
通讯作者：
Xuedong Xu;M. Oda