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Application of rheology gauge to determine rock competency in Taili, western Liaoning, NE China

Wan, Le and Zeng, Zuoxun and Acharyya, Sankha Subhra and Swindle, Carl and Li, Huang (2020) Application of rheology gauge to determine rock competency in Taili, western Liaoning, NE China. Journal of Structural Geology, 130 . Art. No. 103925. ISSN 0191-8141. https://resolver.caltech.edu/CaltechAUTHORS:20191104-095955745

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Abstract

The intensive deformation along with the rheological behavior of the tectonic units in Taili, eastern North China Craton (NCC), are recognized as the manifestation of the presence of the NE–SW striking ductile shear zone in the region. The presence of two types of granitic veins (aplitic and pegmatitic) in Taili exhibit obvious strain refraction and boudinage structures. Ten samples from different rock types are collected to analyze their deformation characteristics and the rheological properties. The analysis is performed by measuring the rock competency following the methods of mainly two types of rheology gauges: (1) Pinch-and-swell structures, and (2) refraction of the veins. We conclude that two main factors control the deformation patterns in Taili, i.e., grain size and proportion of the mineral component. Grain size is found to be one of the dominant factors, controlling the deformation pattern, i.e., the larger the grain size the higher the rock viscosity is. The proportion of the mineral content is another important parameter which is critical to infer the rheological contrast along with the deformational style of the studied region. The rock viscosity of the samples is inversely proportional to the mica and feldspar content of the same. Micro-structural observation suggests that these rocks experienced with a strong extensional deformation at a low to middle-temperature condition (around 450–550 °C) during the Mesozoic. This event transformed the granitic veins into boudins associated with intensive strain-refraction which are also responsible for the formation of voluminous felsic rocks with high viscosity contrast in this region.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.jsg.2019.103925DOIArticle
Additional Information:© 2019 Elsevier Ltd. Received 1 April 2019, Revised 27 October 2019, Accepted 27 October 2019, Available online 31 October 2019. We acknowledge the help of Prof. Liu Zhenghong for the constructive and helpful comments that greatly helped in improving this paper. This work is sponsored by grants from the NSF of China (Grant No. 41230206). The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China41230206
Subject Keywords:Rock competence; Ductile shear zone; Viscosity contrast; Strain refraction; Rheology gauges
Record Number:CaltechAUTHORS:20191104-095955745
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20191104-095955745
Official Citation:Le Wan, Zuoxun Zeng, Sankha Subhra Acharyya, Carl Swindle, Huang Li, Application of rheology gauge to determine rock competency in Taili, western Liaoning, NE China, Journal of Structural Geology, Volume 130, 2020, 103925, ISSN 0191-8141, https://doi.org/10.1016/j.jsg.2019.103925. (http://www.sciencedirect.com/science/article/pii/S0191814119301403)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:99647
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:04 Nov 2019 18:30
Last Modified:12 Nov 2019 17:37

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