Thermal structure of the Dabie eclogite-bearing terrane revealed from the results of Ti-in-zircon thermometry
Version 2 2018-02-15, 09:12
Version 1 2018-02-15, 08:38
Posted on 2018-02-15 - 09:12
Investigation of thermal structure is critical to the interpretation of regional geological structure. This
study sampled 12 gneissic outcrops along an approximately 35 km-long profile striking north–south in the
Dabie eclogite-bearing terrane. Nanoscale secondary-ion mass spectrometry (Nano-SIMS) was used to analyse
the Ti content of zircons from the rocks, and a Ti-in-zircon thermometer was adopted to measure the metamorphic
temperatures of formation. Zircons contain three or four different cathodoluminescent (CL) zones, which
correspondingly yield significant metamorphic temperature estimates. The metamorphic temperatures decrease
along the formation sequence of zircon zones, suggesting that zircon zones formed along an exhumation
pressure–temperature (P–T) path. The peak metamorphic temperatures recorded in zircons from gneissic
samples range from 500 to 800°C and appear to be comparable with the results from the eclogites enclosed
in corresponding gneisses. The determined peak metamorphic temperatures yield large temperature differences
from 50 to 200°C between neighbouring petrological units or samples, which occur within distances of 1–4 km.
The distinct temperature differences suggest that the Dabie eclogite-bearing terrane consists of a stack of seven
or eight tectonometamorphic slices along the profile.
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Liu, Jingbo; Zhang, Lingmin; Cheng, Nanfei; Gao, Yijie; Xie, Liewen (2018). Thermal structure of the Dabie eclogite-bearing terrane revealed from the results of Ti-in-zircon thermometry. Geological Society of London. Collection. https://doi.org/10.6084/m9.figshare.c.4006000.v2
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AUTHORS (5)
JL
Jingbo Liu
LZ
Lingmin Zhang
NC
Nanfei Cheng
YG
Yijie Gao
LX
Liewen Xie