Hornblende thermobarometry of granitoids from the Central Odenwald (Germany) and their implications for the geotectonic development of the Odenwald
Hornblende thermobarometry of granitoids from the Central Odenwald (Germany) and their implications for the geotectonic development of the Odenwald
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DOI：
10.1007/s007100170033
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发表时间：
2001-06
影响因子：
1.8
通讯作者：
E. Stein;C. Dietl
中科院分区：
文献类型：
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作者：
E. Stein;C. Dietl
根据文献记载，Bergsträsser Odenwald的三个主要单元（弗兰肯斯坦杂岩、Flasergranitoid Zone和Bergsträsser Odenwald南部）被两个主要的剪切带分开。本文的目的是通过比较来自闪变花岗岩带的五个岩体的新的角闪石地质温压数据与来自整个Bergsträsser Odenwald的已发表的P-T数据来评估这些缝合线的重要性。此外，文献中的放射性、地球化学和结构数据也用于此目的。温度是用角闪石-斜长石温度计计算的，范围为600至800 °C。使用Al-in-hornhoun气压计测定的侵入深度表明，大多数侵入岩的侵入压力约为4至6千巴（13至20公里）。这些综合数据不允许假设Flasergranitoid带和南部Bergsträsser奥登瓦尔德之间的主要缝合带，而Flasergranitoid带和弗兰肯斯坦杂岩的类似数据的比较验证了这个剪切带的重要性。此外，我们的P-T数据表明，Bergsträsser Odenwald的高温-低压变质作用也可以解释为接触变质作用，而不一定是区域变质作用。
The three major units of the Bergsträsser Odenwald (Frankenstein Complex, Flasergranitoid Zone and southern Bergsträsser Odenwald) are, according to literature, separated by two major shear zones. The aim of the present paper is to evaluate the importance of these sutures by comparing new hornblende geothermobarometry data from five plutons of the Flasergranitoid Zone with published P-T data from the entire Bergsträsser Odenwald. Furthermore radiometric, geochemical and structural data from the literature were also used for this purpose. Temperatures were calculated with the amphibole-plagioclase thermometer and range from 600 to 800 °C. Determinations of the intrusion depth, using the Al-in-hornblende barometer show that most plutons intruded at pressures ranging from about 4 to 6 kbar (13 to 20 km). These combined data do not allow to postulate a major suture zone between the Flasergranitoid Zone and the southern Bergsträsser Odenwald, while comparison of similar data from the Flasergranitoid Zone and the Frankenstein Complex verify the importance of this shear zone. Moreover, our P-T data show that the high temperature – low pressure metamorphism in the Bergsträsser Odenwald can also be interpreted as contact metamorphism and not necessarily as regional metamorphism.