Download PDF by V. P. Wright, M. E. Tucker: Calcretes (Reprint Series of the IAS 2)

By V. P. Wright, M. E. Tucker

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Volcan. 27, 1-J l . L. (1 965) Some aspects of recrystallization i n ancient limestones. In : Dolomite and Limestone Diagenesis : a Symposium (Ed. by L. C. Pray and R. C. M urray), Spec. Pubis Soc. econ. CAROZZI, ' Paleont. Miner. , Tulsa, 13, 14-48 . GARDNER, L . R . ( 1 972) Origin of the Mormon· Mesa caliche, Clark County, Nevada. Bull. geol. Soc. Am. 83, 1 43 - 1 5 6 . H. B. ( 1 967) Morphology of the argillic horizon in desert soils of southern New Mexico. Soil Sci. 106, 6-1 5 . GILE, L . H .

Chemical data were obtained by e lectron microprobe . CON CL U SION S (I) Pedogenic calcretes of the Olduvai and Ndolanya Beds are closely associated with wind-worked volcanic ash of nephelinite or closely related composition. (2) A complete profile with calcrete typically consists of an unconsolidated sedi­ ment overlying laminar calcrete, which coats and overlies a massive calcrete. , 1966). Laminar calcretes of one Olduvai stratigraphic unit were deposited by vadose water below the level of pedogenesis.

No authigenic minerals other than calcite have been identified in this lower calcrete. Thus, authigenic minerals are both less varied and less abundant in the Ndolanya calcretes than in those of Olduvai Gorge. CHEMICAL ASPECTS OF CALCRETE Chemical analyses for six laminar calcretes from Olduvai Gorge (Table 3) are similar to the mean composition for world calcretes computed by Goudie (1972). The Olduvai calcretes average 79·8% CaC03 and 7·2% of Si02, compared to Goudie's (1972) averages of 79·28% of CaC03 and 12·30% Si02• The Olduvai calcretes also compare rather closely with dense laminar calcretes from the High Plains, New Mexico (Aristarain, 1970).

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