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題 名 | The Mineral Chemistry of Fanpaochienshan Gneiss and Associated Amphibolite, Northeastern Taiwan=臺灣東北部飯包尖山片麻岩及其共生角閃岩之礦物化學研究 |
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作 者 | 藍晶瑩; 王執明; | 書刊名 | 中國地質學會會刊 |
卷 期 | 35:1 1992.01[民81.01] |
頁 次 | 頁45-76 |
分類號 | 358.13 |
關鍵詞 | 臺灣; 飯包尖山; 片麻岩; 角閃岩; 礦物化學; |
語 文 | 英文(English) |
中文摘要 | 礦物化學、岩相組織及共生礦物群,指示飯包尖山地區之片麻岩、角閃岩及角閃岩包裹體,至少曾受兩次變質作用。前一期的變質度在角閃岩為綠簾石角閃岩變質相,在片麻岩及包裹角閃岩為高角閃岩變質相。其後產生綠色片岩變質相的降級變質。斜長石、白雲母類、鈣質閃石類及榍石等礦物,隨變質度的不同而改變其化學成分。斜長石在角閃岩變質相(片麻岩及角閃岩中分別的含量為An�鞦澡嶀茍n62-79),比在綠色片岩變質相(An�荃��E)之鈣含量高;白雲母類在角閃岩變質相時呈現斑狀變晶的白雲母,比綠色片岩變質相時的微細片狀多矽白雲母,含較高二氧化鈦、三氧化及二鋁及氧化鈉,和較低二氧化矽及氧化鎂;鈣質閃石類在角閃岩變質相為鎂角閃石及陽起角閃石,在綠色片岩變質相為陽起石;以次要礦物存在的榍石,在角閃岩變質相時,其成分均勻,且鈦含量高,但在綠色片岩變質相時,其鈦含量則變化大。包裹角閃岩呈現鎂角閃石+斜長石+榍石+鈦鐵礦的礦物群及片麻岩中白雲母的矽含量,指示高角閃岩變質相之溫度為攝氏560至700度,壓力為3.0千粑。角閃岩中的陽起角閃石+鈉長石+綠簾石的礦物群,指示綠簾石角閃岩變質相的溫度約為攝氏570度,壓力為3.6千粑。角閃岩中的陽起石+鈉長石+綠泥石的共生礦物群及片麻岩中多矽白雲母的矽含量,指示綠色片岩變質相的溫度為攝氏350至510度,壓力為3千粑。將此區的礦物化學,與臺灣及世界其他地區類似岩性者相比較,則不同片麻岩區的同類礦物,其化學成分,除小有變化外,一般而言極為類似。 |
英文摘要 | Gneiss, amphibolite and amphibolite enclaves from the Fanpaochienshan area were studied for their mineral composition. The mineral chemistry, texture and mineral assemblages of these rocks suggest that at least two stages of metamorphic recrystallization have taken place. The former metamorphic recrystallization varies from epidote amphibolite facies in the amphibolite to upper amphibolite facies in the gneiss and amphibolite enclaves. The superimposed retrograde greenschist facies metamorphism occurred late. A variation in mineral chemistry among the different metamorphic facies in the plagioclase, white mica, calcic amphibole and accessory sphene has been recognized. The plagioclase is high in An content (An �鞦澡� and An 62-79 for the gneiss and amphibolite, respectively) for the amphibolite facies metamorphism, compared to low An content (An �荃��E ) for the greenschist facies metamorphism. White micas occur as porphyroblastic muscovites with higher TiO ��, Al �烙 �� and Na �� O and lower SiO �� and MgO for the amphibolite facies metamorphism compared to flaky phengites for the greenschist facies metamorphism. Ca-amphibole in the amphibolite facies metamor-phism is magnesio-hornblende to actinolitic hornblende while it changes to actinolite in the greenschist facies metamorphism. Usually, the accessory sphenes developed during the amphibolite facies metamorphism are homogeneous and high in Ti, while those developed during the greenschist facies metamorphism are varied in Ti content. The presence of the assemblage magnesio-hornblende + plagioclase + sphene + ilmenite in the amphibolite enclaves together with Si�杠� content of muscovite in the gneiss suggests that they were metamorphosed at temperatures between 560 and 700 ℃ and Pfluid =3Kb. The presence of the assemblage actinolitic hornblende + albite + epidote in the amphibolite indicates that they were metamorphosed at a temperature of about 570 ℃ and Pfluid=3.6Kb. The fact that superimposed greenschist facies metamorphism produced actinolite + albite + chlorite in the amphibolites, together with the Si�杠� content for phengite in the gneiss, suggests that they were metamorphosed at temperatures between 350 to 510 ℃ and Pfluid=3Kb. Comparison is made between the mineral chemistry of this area with that of similar rocks from other gneiss areas in Taiwan and in the world. In general, different minerals from different gneiss area are similar in their mineral chemistry, but minor variations are observed. |
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