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題 名 | Contrasting Cooling Rates of Coeval Granitic Plutons in the Zhangzhou Igneous Complex, SE China: Evidences from 40Ar/39Ar Thermochronology and Al-Amphibole Geobarometer=從漳州複式岩體冷卻史的對比探討花崗岩侵位冷卻時之相互影響 |
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作 者 | 田蓉禮; 陳正宏; 羅清華; 賴宜欣; | 書刊名 | 中國地質學會會刊 |
卷 期 | 40:3 1997.07[民86.07] |
頁 次 | 頁607-624 |
分類號 | 358.43 |
關鍵詞 | 氬-氬定年; 淺侵位岩漿活動; 快速冷卻; 角閃石地質壓力計; 漳州複式岩體; 40Ar/39Ar dating; High-level plutonism; Rapid cooling; Al-amphibole geobarometer; Zhangzhou igneous complex; |
語 文 | 英文(English) |
中文摘要 | 從燕山晚期漳州複式岩體兩不同單元之花崗岩侵入體(長泰及古農岩體)所採集之 含鉀礦物(包括角閃石、黑雲母和鉀長石),經過氬氬定年分析結果指出長泰岩體之角閃石年 代(95.2Ma)與其同時存在之黑雲母之氬氬年代(96.5 Ma)十分相近,其封存溫度分別為594℃ 及402℃,顯示冷卻速率相當快,估計大於300℃/my。氬氬定年結果亦指出較晚侵入之古農 二長花崗岩的角閃石年齡與長泰岩體之角閃石及黑雲母年齡相近,其黑雲母及鉀長石年齡分 別為93.2 Ma及87.5 Ma,鉀長石的年代譜均顯示完整的平台構造,有別於一般花崗岩鉀長 石年代譜之鞍形構造,其原因可能導源於淺侵位花崗岩之快速冷卻。三種礦物之封存溫度分 別為572℃,409℃及175℃,平均從97到87百萬年間的冷卻速率大約為40℃/my,與稍早 侵入的長泰岩體冷卻速率比較顯然較慢。估計長泰岩體高溫階段的快速冷卻主要為淺侵位與 圍岩溫度較低,導致岩漿快速冷卻的結果;較晚侵位的古農岩體則由於稍早侵位的祖地岩體及 長泰岩體的熱擴散尚未達到平衡溫度,以致於古農岩體與圍岩之溫差相對較低,進而導致高 溫階段的冷卻速率相對較低的結果。 |
英文摘要 | K-bearing minerals including hornblende, biotite and K-feldspar from the Kunon and Changtai granite plutons in the Zhangzhou Igneous Complex (ZIC) have been dated with the □Ar/ □Ar step-heating method. An intercept age of 95.2±1.5 Ma for hornblende extracted from the granodiorite of the Changtai pluton is indistinguishable from the plateau age of 96.5±1.4 Ma for biotite from the same sample. Based on the results of closure temperature calculations, 594℃ for hornblende and 402℃ for biotite, an extremely rapid cooling rate, more than 300 ℃/my, is suggested. Whereas, the intercept age of 97.9±1.6 Ma for hornblende from the monzonitic granite of the Kunon pluton is much older than plateau ages of coexisting biotite and K-feldspar (93.5±1.5 Ma and 87.5±1.4 Ma, respectively). K-feldspar yields age spectrum characterized by flat profile, which is an unusual phenomenon in common granitic plutons except shallow ones. Taking the corresponding closure temperatures, 572℃, 409℃ and 175℃ for hornblende, biotite and K-feldspar respectively, a rapid cooling rate of ~40℃/my for the Kunon pluton during the period of 97~87 Ma can be obtained. This tremendous difference of cooling rates between these two plutons may have been due to the thermal effects of coeval/multiple plutonisms. As inferred from Al-amphibole geobarometers, all the plutons emplaced at depths of few kilometers. |
本系統中英文摘要資訊取自各篇刊載內容。