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Paleomagnetism and rock magnetism of the Mississippian Leadville (carbonate) formation and implications for the age of sub‐regional dolomitization
Author(s) -
Horton Robert A.,
Geissman John W.,
Tschauder Richard J.
Publication year - 1984
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl011i007p00649
Subject(s) - dolomitization , geology , paleomagnetism , dolomite , paleozoic , diagenesis , carbonate rock , geochemistry , igneous rock , carbonate , rock magnetism , paleontology , mineralogy , sedimentary rock , magnetization , remanence , materials science , physics , facies , structural basin , quantum mechanics , magnetic field , metallurgy
The Mississippian Leadville Formation of Central Colorado is dolomitized near the Sawatch Uplift and hosts numerous Pb‐Zn‐Ag mineral deposits. Paleomagnetic and rock magnetic data from several dolomite types away from centers of Tertiary intrusive activity imply a late Paleozoic (Late Mississippian, ?) age for the dolomitization (e.g., D = 148°, I = −11°, k = 86, α 95 = 8.6°, N = 3 localities, 31 samples in dolomitized units). The magnetization is of diagenetic origin and was probably acquired during or soon after dolomitization. Tertiary thermochemical activity has overprinted dolomites close to intrusive centers. Data indicate that limestones removed from igneous activity were also remagnetized at the same time.