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| 山东省东平—汶上铁矿带磁铁石英岩地球化学特征及其地质意义 |
| Geochemical Characteristics of BIF from Dongping-Wenshang iron ore zone and its geological significance Shangdong province |
| 投稿时间：2014-05-26 修订日期：2014-05-26 |
| DOI： |
| 中文关键词: 鲁西 东平—汶上铁矿带 鞍山式铁矿 地球化学特征 |
| 英文关键词:the west of Shangdong province Dongping-Wenshang iron ore zone Anshan iron ore Geochemical Characteristics |
| 基金项目:国家自然科学基金(编号41003015)。 |
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| 中文摘要: |
| 东平—汶上铁矿带是鲁西重要的鞍山式铁矿带,矿床赋存于新太古界泰山群山草峪组变质岩中,目前已经探明十余处大、中型铁矿床。通过对矿石及围岩的地球化学研究得出：矿石及围岩轻稀土富集,重稀土相对亏损(LREE/HREE=4.10-5.42),Eu负异常(δEu=0.61-0.96),Ce轻微负异常(δCe=0.93-1.05),大离子亲石原素K、Rb、Ba、Th等在矿石及围岩中明显富集,而高场强元素Ta、Nb、Zr、Hf、Ti等则相对亏损。地球化学特征指示成矿带原岩构造环境为大陆边缘和火山岛弧,火山活动是铁和硅的主要来源,山草峪组变质岩原岩可能经历了多个完整的火山(由基性—中性—酸性)—沉积旋回,火山作用过程中伴随着部分砂质、泥质沉积。 |
| 英文摘要: |
| Dongping-Wenshang iron ore zone is an important Anshan type iron ore zone in the west of Shangdong province, iron deposit occurs in the metamorphic rock of Taishan group Shancaoyu Formation the New Archeozoic. There are more than ten large or medium sized iron ore deposits have been found. Through the study of ore and rock geochemistry conclusion that: ore and surrounding rock’s LREE are enriched, and HREE are depleted relatively (LREE/HREE=4.10-5.42). negative anomaly of Eu (δEu=0.61-0.96), slight negative anomaly of Ce (δCe=0.93-1.05). Negative anomalies of HFSE, and high contents of LILE. Geochemical Characteristics of these original rocks indicate tectonic environment are continental margin and arc. Volcanic activity is the main source of iron and silicon. Volcanic activity experienced multiple mafic-neutral-acid sedimentary cycles. During the process of volcanism along with part of sandy, muddy sediments. |
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