CONTROLLING FACTORS OF CAVERNOUS WEATHERING (TAFONI) IN GRANITE ROCKS OF SOUTHERN MASHHAD AND SHEMSHAK FORMATION ON NORTHERN PARTS OF BINAALOOD

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KHAANEBAAD MOHAMMAD; MOUSAVI HARAMI REZA; MAHBOOBI ASAD O LLAH

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Journal: Journal of Geography and Regional Development Year:2009 | Volume:- | Issue:11 Page(s): 187-208

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Title

CONTROLLING FACTORS OF CAVERNOUS WEATHERING (TAFONI) IN GRANITE ROCKS OF SOUTHERN MASHHAD AND SHEMSHAK FORMATION ON NORTHERN PARTS OF BINAALOOD

Author(s)

KHAANEBAAD MOHAMMAD | MOUSAVI HARAMI REZA | MAHBOOBI ASAD O LLAH | Issue Writer Certificate

Keywords

TAFONIQ3

CAVERNOUS WEATHERINGQ3

MASHHADQ2

GRANULAR DISINTEGRATIONQ3

GRANITEQ2

SALT WEATHERINGQ3

Abstract

The most common weathering features on GRANITE landforms are CAVERNOUS WEATHERING that are known as tafone. TAFONI are deep cavities which are produced by a variety of different weathering mechanisms. This study investigates the formation of TAFONI in the granitic rocks of South MASHHAD and Shemshak formation in semi-arid climatic conditions. Based on petrographical studies, this GRANITE consists of crystal quartz, k-spar, plagioclase and mica. In the study area, TAFONI formed by both physical and chemical weathering processes and are mainly controlled by mineralogical and structural characteristics of the rocks and variations in the local climate and microclimate within the caves. Due to granular fabric of these rocks, one of the most important processes in the formation of these features is GRANULAR DISINTEGRATION of unstable minerals such as feldspar and mica. The in situ weathering soil (under lichens) from GRANITE rocks of Southern MASHHAD was studied by X-Ray diffraction (XRD) and consists of quartz, orthoclase, albite, calcite and clay minerals (kaolinite, illite, montmorillonite). Joints, pegmatite veins, xenoliths, exfoliation, core softening and case hardening of rocks outcrops are other important factors that control the TAFONI initiation and growth. Therefore, the writers suggest the lithology, structure of the rock and environmental effects are the most important control factors of TAFONI occurrence in this region. In Shemshak formation, dissolution of calcareous cement and SALT WEATHERING are the most roles of TAFONI formation in this area.

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APA: Copy

KHAANEBAAD, MOHAMMAD, MOUSAVI HARAMI, REZA, & MAHBOOBI, ASAD O LLAH. (2009). CONTROLLING FACTORS OF CAVERNOUS WEATHERING (TAFONI) IN GRANITE ROCKS OF SOUTHERN MASHHAD AND SHEMSHAK FORMATION ON NORTHERN PARTS OF BINAALOOD. JOURNAL OF GEOGRAPHY AND REGIONAL DEVELOPMENT, -(11), 187-208. SID. https://sid.ir/paper/99045/en

Vancouver: Copy

KHAANEBAAD MOHAMMAD, MOUSAVI HARAMI REZA, MAHBOOBI ASAD O LLAH. CONTROLLING FACTORS OF CAVERNOUS WEATHERING (TAFONI) IN GRANITE ROCKS OF SOUTHERN MASHHAD AND SHEMSHAK FORMATION ON NORTHERN PARTS OF BINAALOOD. JOURNAL OF GEOGRAPHY AND REGIONAL DEVELOPMENT[Internet]. 2009;-(11):187-208. Available from: https://sid.ir/paper/99045/en

IEEE: Copy

MOHAMMAD KHAANEBAAD, REZA MOUSAVI HARAMI, and ASAD O LLAH MAHBOOBI, “CONTROLLING FACTORS OF CAVERNOUS WEATHERING (TAFONI) IN GRANITE ROCKS OF SOUTHERN MASHHAD AND SHEMSHAK FORMATION ON NORTHERN PARTS OF BINAALOOD,” JOURNAL OF GEOGRAPHY AND REGIONAL DEVELOPMENT, vol. -, no. 11, pp. 187–208, 2009, [Online]. Available: https://sid.ir/paper/99045/en

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