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21.
利用蓝晶石制作轻质莫来石耐火砖的研究 总被引:1,自引:0,他引:1
本文研究了利用蓝晶石制作轻质莫来石耐火砖的可行性,并探讨了轻质莫来石耐火砖的基本原理及在烧成过程中的物相变化。实验表明,利用中国丰富的蓝晶石原料可以生产出性能优良的莫来石轻质耐火砖。该制品具有隔热性能好,使用温度高,热容小等特点,是间歇式窑炉轻质耐火内衬的理想材料,可替代同类型的进口产品。 相似文献
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新疆阿尔泰造山带变质作用演化及其地质意义 总被引:10,自引:0,他引:10
阿尔泰造山带发育了一系列低压红柱石型与中压蓝晶石型变质带.红柱石型变质带发育了黑云母带、石榴石带、十字石带、十字石-红柱石带、矽线石带、矽线石-堇青石带:蓝晶石型发育了黑云母带、石榴石带、十字石带、蓝晶石带、矽线石带.中压的蓝晶石序列估算温度为445~747.6℃,压力为0.64~0.95GPa中压序列随变质作用增加.压力有增高趋势:低压的红柱石序列温度445~681℃.压力0.3~0.8GP乱自十字石带后.压力明显降低.可能是靠近热源而导致早期中压痕迹消失.因此红柱石型变质带不是一个正常的变质演化系列.蓝晶石型变质早于红柱石型变质.蓝晶石型变质序列可能与晚古生代弧-陆碰撞事件有关.红柱石序列的形成可能与碰撞相关的广泛花岗岩体侵入及中压岩石抬升有关. 相似文献
25.
Petrology of ultrahigh-pressure rocks from the southern Su-Lu region, eastern China 总被引:44,自引:2,他引:44
RU-YUAN ZHANG T. HIRAJIMA S. BANNO BOLIN CONG J. G. LIOU 《Journal of Metamorphic Geology》1995,13(6):659-675
Abstract In the Su-Lu ultrahigh- P terrane, eastern China, many coesite-bearing eclogite pods and layers within biotite gneiss occur together with interlayered metasediments now represented by garnet-quartz-jadeite rock and kyanite quartzite. In addition to garnet + omphacite + rutile + coesite, other peak-stage minerals in some eclogites include kyanite, phengite, epidote, zoisite, talc, nyböite and high-Al titanite. The garnet-quartz-jadeite rock and kyanite quartzite contain jadeite + quartz + garnet + rutile ± zoisite ± apatite and quartz + kyanite + garnet + epidote + phengite + rutile ± omphacite assemblages, respectively. Coesite and quartz pseudomorphs after coesite occur as inclusions in garnet, omphacite, jadeite, kyanite and epidote from both eclogites and metasediments. Study of major elements indicates that the protolith of the garnet-quartz jadeite rock and the kyanite quartzite was supracrustal sediments. Most eclogites have basaltic composition; some have experienced variable 'crustal'contamination or metasomatism, and others may have had a basaltic tuff or pyroclastic rock protolith.
The Su-Lu ultrahigh- P rocks have been subjected to multi-stage recrystallization and exhibit a clockwise P-T path. Inclusion assemblages within garnet record a pre-eclogite epidote amphibolite facies metamorphic event. Ultrahigh- P peak metamorphism took place at 700–890° C and P >28 kbar at c . 210–230 Ma. The symplectitic assemblage plagioclase + hornblende ± epidote ± biotite + titanite implies amphibolite facies retrogressive metamorphism during exhumation at c . 180–200 Ma. Metasedimentary and metamafic lithologies have similar P-T paths. Several lines of evidence indicate that the supracrustal rocks were subducted to mantle depths and experienced in-situ ultrahigh- P metamorphism during the Triassic collision between the Sino-Korean and Yangtze cratons. 相似文献
The Su-Lu ultrahigh- P rocks have been subjected to multi-stage recrystallization and exhibit a clockwise P-T path. Inclusion assemblages within garnet record a pre-eclogite epidote amphibolite facies metamorphic event. Ultrahigh- P peak metamorphism took place at 700–890° C and P >28 kbar at c . 210–230 Ma. The symplectitic assemblage plagioclase + hornblende ± epidote ± biotite + titanite implies amphibolite facies retrogressive metamorphism during exhumation at c . 180–200 Ma. Metasedimentary and metamafic lithologies have similar P-T paths. Several lines of evidence indicate that the supracrustal rocks were subducted to mantle depths and experienced in-situ ultrahigh- P metamorphism during the Triassic collision between the Sino-Korean and Yangtze cratons. 相似文献
26.
华中高压-超高压变质富铝岩石为陆壳岩石经变质而成,其典型的岩石类型为蓝晶石黄玉石英岩。矿物温压计估算其p-T条件为T=700℃,p=1.2GPa;高温高压实验结果表明,蓝晶石+黄玉组合在T=1000~1200℃,P=3.1~3.77GPa范围内可以稳定存在,是高压-超高压变质作用产物。在蓝晶石石英岩中发现柯石英及柯石英假象,区域上其它岩石组合也有高压-超高压变质作用的证据。变质富铝岩石为榴辉岩相变质作用产物,从而证明陆壳岩石可以经历>2.0GPa的变质压力条件。 相似文献
27.
通过电子探针成分分析和矿物共生组合分析,利用地质温度计估算十字石、蓝晶石和红柱石的形成温压条件,以揭示十字石、蓝晶石和红柱石的形成与本区西川河断裂区域变质作用的关系。研究结果表明:本区西川河断裂以北地区出露的十字石和蓝晶石形成条件受压力控制(P=5.5-7Kpa),变质温度为520-550℃;而西川河断裂以南地区出露的红柱石的形成条件主要受温度控制(T=570-600℃),压力小于3Kpa。西川河断裂控制了南北地区的变质条件,进而控制了特征变质矿物十字石、蓝晶石和红柱石的空间分布。 相似文献
28.
Evidence from Fe- and Al-rich metapelites for thrust loading in the Transangarian region of the Yenisey Ridge, eastern Siberia 总被引:1,自引:0,他引:1
I. I. Likhanov O. P. Polyansky V. V. Reverdatto I. Memmi 《Journal of Metamorphic Geology》2004,22(8):743-762
In the Transangarian region of the Yenisey Ridge in eastern Siberia (Russia), Fe‐ and Al‐rich metapelitic schists of the Korda plate show field and petrological evidence of two superimposed metamorphic events. An early middle Proterozoic event with age of c.1100 Ma produced low‐pressure, andalusite‐bearing assemblages at c. 3.5–4 kbar and 540–560 °C. During a subsequent late Proterozoic event at c. 850 Ma, a medium‐pressure, regional metamorphic overprint produced kyanite‐bearing mineral assemblages that replaced minerals formed in the low‐pressure event. Based on the results of geothermobarometry and P–T path calculations it can be shown that pressure increased from 4.5 to 6.7 kbar at a relatively constant temperature of 540–600 °C towards a major suture zone called the Panimba thrust. In order to produce such nearly isothermal loading of 1–7 °C km ?1, we propose a model for the tectono‐metamorphic evolution of the study area based on crustal thickening caused by south‐westward thrusting of the 5–7 km‐thick upper‐plate metacarbonates over lower‐plate metapelites with velocity of c. 350 m Myr?1. A small temperature increase (up to 20 ± 15 °C) of the upper part of the overlapped plate is explained by specific behaviour of steady‐state geotherms calculated using lower radioactive heat production of metacarbonates as compared with metapelites. The suggested thermal‐mechanical model corresponds well with P–T paths inferred from obtained thermobarometric data and correlates satisfactorily with P–T trajectories predicted by other two‐dimensional thermal models for different crustal thickening and exhumation histories. 相似文献
29.
A laser fusion Ar-Ar technique applied on single crystals of kyanite from river sands of the Kitakami Mountain region of northeast Japan yielded ages of up to 16 Ga, more than three times the age of the earth. Although the age values are geologically meaningless, the ultra-high excess argon in kyanites is unique and hitherto unreported. We interpret this to be an artifact of ultra-high argon pressure derived from radiogenic argon in potassium-rich phases such as phengites during the Barrovian type retrogression of the ultra-high pressure rocks in this region. 相似文献
30.
蓝晶石类矿为四川省短缺矿种之一。本文根据变质成矿理论,结合己有蓝晶石类矿化特征,具体分析四川省蓝晶石类矿的成矿地质条件,提出全省蓝晶石类矿的找矿方向及有利地段。 相似文献