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新疆阿勒泰递增变质带KMnFMASH变质相体系研究
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摘要
利用THERMOCLAC3.3计算软件,计算了与阿勒泰递增变质带中典型的石榴石-十字石带及十字石-红柱石带相对应的温压成分剖面图解(P-T Pseudosection),并对上述二个变质带所经历的变质峰期条件作了相对定量的限定。
     与在石榴石-十字石带中所所选的两块样品相对应的变质峰期条件为:P=6.3 kbar,T=585℃;P=7.8kbar,T=600℃。
     十字石-红柱石带所经历的变质峰期条件为:P=6.8kbar-7kbar,T=660℃-670℃。
     在作者计算出的P-T成分剖面图解(P-T pseudosection)中,红柱石带的变质峰期条件落在蓝晶石稳定域中,由此作者推断阿勒泰递增变质带中的红柱石型递增变质带是由先前的蓝晶石型递增变质带在隆升减压过程中发生退变质作用而所形成的。进一步证明了本地区红柱石型变质带来源于蓝晶石型变质带结论的正确性。
     石榴石-十字石带与十字石-红柱石带的变质P-T轨迹都为峰期压力早于峰期温度出现的顺时针轨迹,说明了此变质带为碰撞造山带型的变质带。
     阿勒泰地区广泛发育的带状递增变质带的峰期变质压力大都在6 kbar -8 kbar,属于中压型变质带,并非典型的低压型变质带或是中低压过渡型变质带,峰期变质温度大都在600℃-670℃,并不是高温,所以本区不是严格意义的低压型变质带,而是中压中温型递增变质带。
     根据此地峰期变质作用年龄大约在261-168Ma,推断阿尔泰造山作用主要发生在二叠纪时期。
The zonal progressive metamorphic zones are widely distributed in Aletai area, typical zonal metamorphic zones which have been recorded are biotite zone, garnet zone, staurolite zone, staurolite - andalusite zone, staurolite– kyanite zone, sillimanite zone.
     Author quantitatively estimate the P-T evolution path and metamorphic peak condition of biotite– garnet zone, garnet– staurolite zone, staurolite– andalusite zone on the basis of using THERMOCALC 3.30 software fluently to calculate the KMnFMASH P-T Pseudosection for each metamorphic zone and using the Fe、Mn content isopleths: x(g),x(m) in garnet and H2O content isopleths in the paragenetic mineral.
     The main characteristic metamorphic minerals in rocks that form the biotite– garnet zone are biotite, garnet. The Fe、Mg、Mn content of biotite do not change severely, but are similar to the biotite in other two metamorphic zones. The Fe, Mg content of garnet are 1/3-1/2 compared with other two metamorphic zones, by contrast, the Mn content are 2-3 times larger than other two metamorphic zones.
     The main characteristic metamorphic minerals in rocks that form the garnet– staurolite zone are chlorite, muscovite, biotite, garnet and staurolite. Author chose two typical specimens to study the garnet– staurolite zone. The first one represents the initial stage of staurolite zone, the second one represents later stage of staurolite zone, in this specimen, the staurolite will be consumed away quickly. Garnet in the rocks forming the metamorphic zone has no composition zone.
     The main characteristic metamorphic minerals in rocks that form the staurolite– andalusite zone are chlorite, muscovite, biotite, garnet, staurolite and andalusite. The Fe content of this zone is more than the other two metamorphic zones, but Mg、Mn content are less than the other two metamorphic zones.
     The representative specimens 112-4 for garnet– staurolite zone and 104-9 for staurolite– andalusite zone have clear composition zone, especially the Fe, Mn elements zone. So, the P– T path defined by Fe, Mn content in garnet, of these two metamorphic zone are more accurately. If we match these P– T paths to metamorphic ages, we will get the P– T– t path of these metamorphic zones.
     By calculating the P– T Pseudosection for zone, garnet– staurolite zone, staurolite– andalusite zone in zonal progressive metamorphic zones of Aletai, Xingjiang, Athor limited the metamorphic peak condition of garnet– staurolite zone, staurolite– andalusite zone. The metamorphic peak condition of garnet - staurolite zone is P=6.3 kbar -7.8kbar,T=585℃-600℃, after the peak condition, garnet - staurolite zone experienced a retrograde metamorphic point P=6.5kbar-6.8kbar,T=585℃-595℃; The metamorphic peak condition of staurolite - andalusite zone is P=6.8kbar-7kbar,T=660℃-670℃。
     Andalusite in rocks forming the staurolite– andalusite zone locate in the area in which kyanite is stable, Wei et al.(2006)has putted forth that the andalusite-type metamorphic zones in Aletai zonal progressive zones are the production of retrograde of kyanite-type metamorphic zone during the exhuming and decompression process. Now, author gets the same conclusion from calculated P-T pseudosection, which gives more evidence to the conclusion.
     The metamorphic peak pressure of zonal progressive metamorphic zones in Aletai mainly around 6 kbar -8 kbar, are not typical low-pressure -type metamorphic zones, but medium type metamorphic zones; peak temperature mostly during 600℃-670℃. So these zonal progressive metamorphic zones in Aletai are not strict low-pressure heating metamorphic zones, but the medium pressure metamorphic zones.
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