TY - JOUR
T1 - Multiple authigenesis of K-feldspar in sandstones
T2 - evidence from the Cretaceous Areado Formation, Sao Francisco Basin, central Brazil
AU - De Ros, L. F.
AU - Sgarbi, G. N.C.
AU - Morad, S.
PY - 1994
Y1 - 1994
N2 - Feldspar authigenesis occurred in two major episodes. 1) In the Early Cretaceous K-feldspar precipitated as overgrowths, healing of microfractures, and replacement of detrital K-feldspar and plagioclase at very shallow depths. Authigenesis was related to meteoric dissolution of detrital volcanic feldspars, volcanic vitric rock fragments, and micas in a hot semiarid climate. 2) In the Late Cretaceous, while still at shallow depths, K-feldspar precipitated as abundant fine crystals associated with opal-CT, hematite, and mixed-layer illite/smectite. -from Authors
AB - Feldspar authigenesis occurred in two major episodes. 1) In the Early Cretaceous K-feldspar precipitated as overgrowths, healing of microfractures, and replacement of detrital K-feldspar and plagioclase at very shallow depths. Authigenesis was related to meteoric dissolution of detrital volcanic feldspars, volcanic vitric rock fragments, and micas in a hot semiarid climate. 2) In the Late Cretaceous, while still at shallow depths, K-feldspar precipitated as abundant fine crystals associated with opal-CT, hematite, and mixed-layer illite/smectite. -from Authors
UR - http://www.scopus.com/inward/record.url?scp=0028564106&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0028564106
SP - 778
EP - 787
JO - Journal of Sedimentary Research A: Sedimentary Petrology & Processes
JF - Journal of Sedimentary Research A: Sedimentary Petrology & Processes
IS - A64(4)
ER -