Search in Medwell
 
 
Journal of Engineering and Applied Sciences
Year: 2008 | Volume: 3 | Issue: 7 | Page No.: 560-568
Some Structural Features of Sulu Terrane (Eastern China) from Well Logs and Images
A.M.A. Salim and H.P. Pan
 
Abstract: The structure of Sulu Ultrahigh-Pressure (UHP) metamorphic belt in eastern China is so complicated and different models have been suggested by many authors. Although, the interpretation of different structural features from geophysical logs is quite ambiguous, but availability of various well logs and images made it possible. At least 2 sets of faults are identified within the studied depth range. One is parallel to the well known Tanlu fault, dipping steeply (69-73°) to ESE (101-105°) direction. They are expected to bring the ultramafics and associate eclogites and paragneisses to upper levels. The 2nd is within the country rocks. They mainly dip moderately to SSE. Those faults are coincidence with shearing and foliation of different metamorphic rocks. CCSD-MH reaches many shear zones at different depths. They mainly dip moderately (42-56°) to southeast (127-149°), coinciding with many shear zones detected in the surface. The eclogite blocks, display strong, flattened foliations and stretching lineations that are generally consistent with those of the country rocks. Locally, the early UHP foliation is crosscut by late amphibolite facies shear zones. Fractures of the upper depth’s are steeply dipping to nearly east and west. While, those of the middle and lower depths are mostly of gentle dips to SSE and NNW. The Vp contrast between eclogite and other lithologies is distinctive, so this can locate the high acoustic wave reflectors recognized during seismic survey. No high velocity anomaly at depth between 3.2 and 4.7 km, as expected by seismic survey, is recognized by well logs. The maximum horizontal stress direction is NE-SW as deducted by borehole breakout shown in the acoustic images.
 
How to cite this article:
A.M.A. Salim and H.P. Pan , 2008. Some Structural Features of Sulu Terrane (Eastern China) from Well Logs and Images. Journal of Engineering and Applied Sciences, 3: 560-568.
URL: http://medwelljournals.com/abstract/?doi=jeasci.2008.560.568