| 陈静,韩杰,余福承,王秉璋,李五福.青海茶卡北山锂稀有多金属矿床白云母40Ar-39Ar定年及其地质意义[J].地质找矿论丛,2022,37(2):142-147 |
| 青海茶卡北山锂稀有多金属矿床白云母40Ar-39Ar定年及其地质意义 |
| 40Ar-39Ar dating of muscovite in Chaka Beishan Li-polymetallic deposit in Qinghai province and the geological significance |
| 投稿时间：2021-09-17 |
| DOI：10.6053/j.issn.1001-1412.2022.02.003 |
| 中文关键词: 伟晶岩型 锂稀有多金属矿床 白云母 40Ar-39Ar同位素测年 茶卡北山 青海省 |
| 英文关键词:pegmatite type Li-rare polymetallic deposit muscovite 40Ar-39Ar Chaka Beishan area Qinghai province |
| 基金项目:国家自然科学基金(编号:41862011)、中国科学院"西部之光"人才培养引进计划和青海省省级财政资金勘查项目(编号:2020021022jc013)联合资助。 |
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| 中文摘要: |
| 宗务隆构造带南侧的成矿环境与"马尔康-雅江-喀喇昆仑巨型锂矿带"具有很大的相似性,新发现的茶卡北山伟晶岩型锂多金属矿床证实此带是青藏高原北部的一条重要的锂、铍矿成矿带,该矿床内含矿伟晶岩主要为含锂辉石花岗伟晶岩和含绿柱石白云母花岗伟晶岩,形成于晚三叠世。对含矿白云母伟晶岩进行白云母40Ar-39Ar同位素测年结果显示,随着温度从750 ℃逐渐升到1100 ℃,白云母40Ar-39Ar年龄坪非常平坦,其年龄值为210.4 Ma—212.7 Ma,坪年龄为212.60 Ma±0.64 Ma,与晚期伟晶岩结晶年龄相近,基本限定茶卡北山伟晶岩型锂稀有多金属矿床的成矿年龄为晚三叠世晚期。 |
| 英文摘要: |
| The area in the south of Zonglong tectonic belt is very similar in metallogenic setting to the Markang-Yajiang-Karakoram giant Li ore belt and Chaka Beishan pegmatite type Li- poly metallic deposit is newly discovered here proving the area a new important Li-Be mineralization belt in the North of Qinghai-Tibet plateau. The Late Trassic spodumene-bearing granitic pegmatite and the beryl-bearing muscovite granitic pegmatite are mainly the ore hosts. 40Ar-39Ar dating of muscovite from the muscovite granitic pegmatite shows that at the temerature rising from 750 ℃ to 1100 ℃ the age plateau of the muscovite get very flat. The age value is 210.4 Ma-212.7 Ma and the plateau age 212.60 Ma±0.64 Ma, very close to that of crystallization of the pegmatite corresponding the Late Triassic. |
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