A study of Sr, Nd and O isotopes of the K-rich melanocratic dykes in the late Mesozoic gold field in the Jiaodong Peninsula
文献类型：期刊论文
| 作者 | Sun, JG; Hu, SX; Liu, JM; Shen, K; Ling, HF |
| 刊名 | ACTA GEOLOGICA SINICA-ENGLISH EDITION
 |
| 出版日期 | 2001-12-01 |
| 卷号 | 75期号:4页码:432-444 |
| 关键词 | late Mesozoic K-rich melanocratic dykes Sr, Nd and O isotope geochemistry gold field system in the Jiaodong Peninsula |
| ISSN号 | 1000-9515 |
| 文献子类 | Article |
| 英文摘要 | Geologic, petrographic and petrochemical studies of the late Mesozoic K-rich melanocratic dykes, including lamprophyres, andesite porphyrites and dacite-porphyry in the gold field system in the Jiaodong Peninsula, China, have shown that these dykes are characterized by rich potassium and alkali but poor titanium. They belong to an ultra-high potassic, shoshonitic and high potassic calc-alkaline rock series. The parental magma has relatively high initial strontium ratios ((Sr-87/Sr-86)(i)=0.70895-0.71140) and low (Nd-143/Nd-144)(i) ratios (varying from 0.51135 to 0.51231); and its delta O-18(SMOW), values vary from +5.8 parts per thousand to +10.6 parts per thousand with a mean of +7.1 parts per thousand. These features suggest that the source region of the magma is an enriched mantle wedge transformed from a continental lithosphere mantle which has experienced metasomatism by mantle-derived fluids with H2O-dominated fluids that were provided during the underthrusting of an ocean crust. The initial magma was generated by low-degree partial melting of the enriched mantle in its mature stage in the back-are spreading environment. The evolution of magmas is associated with two trends, i.e., fractional crystallization and mixing with or intensive contamination by palaeo-crust materials or metamorphic rocks. The former process is evident in the gold field system of quartz-vein type, whereas the latter is dominated in die gold field system of the altered-rock type. This conclusion is very important for more detailed study of petrogenesis and mineralization through the crust-mantle interaction (exchange) in the Mesozoic in this region. |
| WOS关键词 | POTASSIC IGNEOUS ROCKS ; VOLCANIC-ROCKS ; MANTLE ; GEOCHEMISTRY ; OXYGEN ; BASALTS ; METASOMATISM ; LAMPROPHYRES ; SYSTEMATICS ; SETTINGS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000172268600011 |
| 出版者 | GEOLOGICAL SOC CHINA |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/77141]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Sun, JG |
| 作者单位 | 1.Jilin Univ, Inst Earth Sci, Changchun 130062, Peoples R China 2.Nanjing Univ, State Key Lab Res Metallogenesis Endogen Ore Depo, Nanjing 210093, Peoples R China 3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100101, Peoples R China 4.Shandong Inst, Jinan 250013, Peoples R China 5.Lab Geol Sci, Jinan 250013, Peoples R China |
| 推荐引用方式 GB/T 7714 | Sun, JG,Hu, SX,Liu, JM,et al. A study of Sr, Nd and O isotopes of the K-rich melanocratic dykes in the late Mesozoic gold field in the Jiaodong Peninsula[J]. ACTA GEOLOGICA SINICA-ENGLISH EDITION,2001,75(4):432-444. |
| APA | Sun, JG,Hu, SX,Liu, JM,Shen, K,&Ling, HF.(2001).A study of Sr, Nd and O isotopes of the K-rich melanocratic dykes in the late Mesozoic gold field in the Jiaodong Peninsula.ACTA GEOLOGICA SINICA-ENGLISH EDITION,75(4),432-444. |
| MLA | Sun, JG,et al."A study of Sr, Nd and O isotopes of the K-rich melanocratic dykes in the late Mesozoic gold field in the Jiaodong Peninsula".ACTA GEOLOGICA SINICA-ENGLISH EDITION 75.4(2001):432-444. |
入库方式： OAI收割
来源：地质与地球物理研究所
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