| 广东南澳和莲花山韧性剪切带^40Ar／^39Ar年龄及其地质意义 |
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| 引用本文：邹和平,王建华,丘元禧.2000.广东南澳和莲花山韧性剪切带^40Ar／^39Ar年龄及其地质意义[J].地球学报,21(4):356-364. |
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| 基金项目:广东省重点科研项目，专题研究“广东沿海地壳结构、构造格架与构造演化”(项目号：900960101) |
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| 中文摘要:采自广东南澳韧性剪切带和莲花山韧性剪切带的6个单矿物的40Ar/39Ar年龄谱数据可分为3组：151～162Ma、117.5～129.7Ma、66～97Ma。第1组年龄代表较深层次逆冲、褶皱和动热变质的时代，该期间沿莲花山断裂带开始出现火山活动；第2组年龄(2/3样品40Ar/39Ar坪年龄值集中于这一组范围内)，代表强烈韧性剪切、左行平移兼逆断层活动的时代，即韧性剪切带的形成时代，此期在南澳断裂带还发生了混合岩化和花岗岩化作用；第3组年龄代表后期热扰动，即韧脆性转化、右行平移正断层活动和地壳伸展的时代。年代学资料还表明，莲花山断裂带西南段自117.5Ma以来受伸展控制的冷却上升速率大约为0.03～0.29mm/a。 |
| 中文关键词:南澳 莲花山 韧性剪切带 40Ar/39Ar年龄 广东 |
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| 40Ar/39Ar ages of the Nan'ao Shear Zone and the Lianhuashan Shear Zone in Guangdong Province and Their Geological Significance |
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| Abstract:Ar/39 Ar ages of six single mineral samples from the Nan'ao ductile shear zone and the Lianhuashan ductile shear zone can be divided into three groups: 151～162 Ma, 117.5～129.7 Ma and 66～97 Ma.Ages of the first group represent the period of thrusting,folding and dynamo thermal metamorphsim at the deep tectonic level, during which there occurred volcanic activities along the Lianhuashan zone.Ages of the second group, which cover 40 Ar/ 39 Ar plateau ages of two thinds samples, represent the time of strong ductile shearing and reverse sinistral strike slip faulting, i.e., the time when the ductile shear zones were formed. In this period, migmatization and granitization took place along the Nan'ao zone. Ages of the third group indicate the late thermal perturbation, namely the period of the ductile brittle transformation, dextral strike slip normal faulting and crustal extension. Geochronological data show that the cooling uplifting of the southwestern segment in the Lianhuashan zone controlled by the crustal extension since 117.5 Ma B.P.is at a rate of about 0.03～0.29 mm/a. |
| keywords:Guangdong Nan'ao Lianhuashan ductile shear zone 40Ar/39Ar ages |
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