The Apollo 14 Regolith: Petrology of cores 14210/14211 and 14220 and soils 14141, 14148, and 14149

New modal data are presented for continuous polished thin sections from double drive tube 14210/14211, and single drive tube 14220, and for polished grain mounts of four soils from the double drive tube, one from the single drive tube, and the soils 14148 (trench top), 14149 (trench bottom), and 14141 (Cone Crater). Modal data show that the Cone Crater soil is immature, whereas the ‘smooth plains’ soils are mature and rich in agglutinates and breccias. Neither core exhibits any major variations with depth. Microprobe analyses of mineral and glass fragments are consistent with derivation of the soils predominantly from the local rocks, with ∼5–11% exotic mare component indicated by the modal data. About 4% of the glasses are SiO2- and K2O-rich granitic glasses which are comminuted mesostasis from the local melt rocks. The soils are depleted in feldspar relative to the source rocks. The preferred explanation for this depletion is that feldspar is concentrated in the <10 μm fines and is consumed in the formation of agglutinates, regolith breccias, and feldspathic glass.

[1]  J. A. Minkin,et al.  Apollo 14 glasses of impact origin and their parent rock types. , 1972 .

[2]  D. Vaniman,et al.  Lunar highland melt rocks - Chemistry, petrology and silicate mineralogy , 1980 .

[3]  F. J. Flanagan.  1972 values for international geochemical reference samples , 1973 .

[4]  W. Boynton,et al.  Lithophiles, siderophiles, and volatiles in Apollo 16 soils and rocks , 1976 .

[5]  R. Arvidson,et al.  Horizontal transport of the regolith, modification of features, and erosion rates on the lunar surface , 1975 .

[6]  J. Papike,et al.  The relationship of the lunar regolith less than 10-microns fraction and agglutinates. II - Chemical composition of agglutinate glass as a test of the 'fusion of the finest fraction' /F3/ model , 1982 .

[7]  A. Albee,et al.  Comparative petrology of Apollo 16 sample 68415 and Apollo 14 samples 14276 and 14310 , 1972 .

[8]  D. Mckay,et al.  Lunar Regolith: Petrology of the <10 μm fraction , 1982 .

[9]  J. Papike,et al.  The lunar regolith - Comparative petrology of the Apollo sites , 1980 .

[10]  J. C. Laul,et al.  The lunar regolith: comparative studies of the Apollo and Luna sites. Chemistry of soils from Apollo 17, Luna 16, 20, and 24. , 1982 .

[11]  F. Hörz,et al.  Debye-scherrer investigations of experimentally shocked silicates , 1973 .

[12]  R. Korotev.  Compositional Trends in Apollo 16 Soils , 1982 .

[13]  A. Albee,et al.  Petrologic and mineralogic investigation of some crystalline rocks returned by the Apollo 14 mission. , 1971 .

[14]  V. Oberbeck,et al.  Development of the mare regolith: Some model considerations , 1975 .

[15]  The relationship of the lunar regolith less than 10 micrometer fraction and agglutinates. I - A model for agglutinate formation and some indirect supportive evidence , 1982 .

[16]  J. M. Rhodes,et al.  Mare basalts: Crystal chemistry, mineralogy, and petrology , 1976 .

[17]  The lunar regolith - Comparative chemistry of the Apollo sites , 1980 .

[18]  Provenance of KREEP and the exotic component: elemental and isotopic studies of grain size fractions in lunar soils. , 1974 .

[19]  Geochemistry of grain-size fractions of soils from the Taurus-Littrow valley floor , 1976 .

[20]  L. Haskin.  Test of a model for trace element partitioning during closed-system solidification of a sikicate liquid , 1977 .

[21]  W. Ridley,et al.  The major element compositions of lunar rocks as inferred from glass compositions in the lunar soils. , 1972 .

[22]  E. Roedder,et al.  Lunar petrology of silicate melt inclusions, Apollo 11 rocks , 1970 .

[23]  D. Vaniman,et al.  The Apollo 17 drill core: petrologic systematics and the identification of a possible Tycho component. , 1979 .

[24]  A. Albee,et al.  Empirical Correction Factors for the Electron Microanalysis of Silicates and Oxides , 1968, The Journal of Geology.

[25]  D. Mckay,et al.  Apollo 14 soils: Size distribution and particle types , 1972 .

[26]  J. K. Mitchell,et al.  Soil mechanics experiment , 1971 .

[27]  Irradiation history of the lunar regolith at the Apollo 14, 15, and 17 sites - Additional insights , 1980 .

[28]  M. T. Naney,et al.  The Apollo 16 drill core - Statistical analysis of glass chemistry and the characterization of a high alumina-silica poor /HASP/ glass , 1976 .

[29]  P. A. Baedecker,et al.  Mixing and transport of lunar surface materials - Evidence obtained by the determination of lithophile, siderophile, and volatile elements , 1975 .