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Mg-Smectite Authigenesis in a Marine Evaporative Environment, Salina Ometepec, Baja California

Published online by Cambridge University Press:  28 February 2024

Victoria C. Hover ,
Lynn M. Walter ,
Donald R. Peacor  and
Anna M. Martini
Victoria C. Hover*
Affiliation:
Department of Geological Sciences, University of Michigan, 2534 C. C. Little Building, 425 E. University, Ann Arbor, Michigan 48109-1063, USA
Lynn M. Walter
Affiliation:
Department of Geological Sciences, University of Michigan, 2534 C. C. Little Building, 425 E. University, Ann Arbor, Michigan 48109-1063, USA
Donald R. Peacor
Affiliation:
Department of Geological Sciences, University of Michigan, 2534 C. C. Little Building, 425 E. University, Ann Arbor, Michigan 48109-1063, USA
Anna M. Martini
Affiliation:
Department of Geological Sciences, University of Michigan, 2534 C. C. Little Building, 425 E. University, Ann Arbor, Michigan 48109-1063, USA
*
†Present Address: Department of Geological Sciences, Rutgers/Newark, 407 Boyden Hall, 195 University Ave., Newark, New Jersey 07102, USA.
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Abstract

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Formation of authigenic trioctahedral Mg-rich smectite is common in evaporative lake sediments, but was not described previously in modern marine evaporative environments. This study documents formation of authigenic K-rich, Mg-smectite during very early diagenesis in the dominantly siliciclastic Salina Ometepec (Baja California), a large supratidal evaporative sabkha complex near the mouth of the Colorado River. Here, sediment pore waters are exceptionally Mg2+-rich relative to other marine evaporative environments due to suppressed sulfate reduction which limits production of carbonate alkalinity and, hence, carbonate (particularly dolomite) precipitation. Sediment cores were obtained along a five km transect seaward across the hypersaline mud flat to evaluate how these atypical geochemical conditions would affect the clay mineral compositions.

Scanning transmission electron microscopy (STEM) observations show that the smectite from the marine Inlet, near the sediment source, consists of grains of irregular shape that give selected area diffraction (SAED) patterns reflecting dominant turbostratic stacking. Analytical electron microscopy (AEM) analyses indicate that K+ is the dominant interlayer cation; the mean composition is approximately K0.7(Al3.3Fe(III)0.3Mg0.5)(Al0.5Si7.5)O20(OH)4. Such smectite is implied to be detrital in part because it is similar to smectite known to be deposited by the Colorado River.

Smectite from the hypersaline mud flat occurs as aggregates of small subhedral pseudohexagonal plate or lath-shaped crystals ≤250 nm in diameter, with thicknesses varying between three and ten layers. The SAED patterns reflect substantial turbostratic stacking, but with a greater frequency of interlayer coherency as compared with detrital smectite. Crystals from greater sediment depths are larger and more nearly euhedral. This smectite is dominantly trioctahedral, with mean composition approximately K0.7(Al0.7Fe(III)0.5Mg4.45)(Al1.2Si6.8)O20(OH)4 (saponitic). This smectite is inferred to be dominantly authigenic in origin.

The X-ray diffraction (XRD) and STEM/AEM data collectively imply that detrital aluminous dioctahedral smectite reacts to form authigenic Mg-rich trioctahedral smectite, driven in part by the high Mg2+/ Ca2+ ratio of pore waters. Such early-formed Mg-rich smectite may be the precursor for the trioctahedral mixed-layer smectite, corrensite, and chlorite assemblages found in ancient marine evaporative sequences. These results also add to the accumulating evidence that interlayer K+ in marine smectite is fixed during the earliest stages of marine diagenesis near the sediment water interface.

Keywords

Baja CaliforniaEarly DiagenesisHypersaline BrinesK-smectiteMg-smectiteSalina OmetepecSaponiteTrioctahedral Smectite
Type
Research Article
Information
Clays and Clay Minerals , Volume 47 , Issue 3 , June 1999 , pp. 252 - 268
Copyright
Copyright © 1999, The Clay Minerals Society

References

Ahn, J.H. and Peacor, D.R., 1989 Illite/smectite from Gulf Coast shales: A reappraisal of transmission electron microscope images Clays and Clay Minerals 37 542–546 10.1346/CCMN.1989.0370606.Google Scholar
Ataman, G. and Baysal, O., 1978 Clay mineralogy of Turkish borate deposits Chemical Geology 22 233–247 10.1016/0009-2541(78)90033-5.CrossRefGoogle Scholar
Andreason, M.W., 1992 Coastal siliciclastic sabkhas and related evaporative environments of the Permian Yates Formation, North Ward-Estes Field, Ward County, Texas American Association of Petroleum Geologists Bulletin 76 1735–1759.Google Scholar
Baba, J. Peterson, C.D. Schrader, H.J., Dauphin, J.P. and Simoneit, B.R.T., 1991 Modern fine-grained sediments in the Gulf of California The Gulf and Peninsular Province of the Californias .CrossRefGoogle Scholar
Baba, J. Peterson, C.D. Schrader, H.J., Dauphin, J.P. and Simoneit, B.R.T., 1991 Finegrained terrigenous sediment supply and dispersal in the Gulf of California during the last century The Gulf and Peninsular Province of the Californias .CrossRefGoogle Scholar
Bailey, S.W., 1988 X-ray diffraction identification of the po-lytypes of mica, serpentine and chlorite Clays and Clay Minerals 36 193–213 10.1346/CCMN.1988.0360301.CrossRefGoogle Scholar
Banfield, J.F. Jones, B.F. and Veblen, D.R., 1991 An AEM-TEM study of weathering and diagenesis, Abert Lake, Orgeon: I. Weathering reactions in the volcanics Geochimica et Cosmochimica Acta 55 2781–2793 10.1016/0016-7037(91)90444-A.CrossRefGoogle Scholar
Banfield, J.F. Jones, B.F. and Veblen, D.R., 1991 An AEM-TEM study of weathering and diagenesis, Abert Lake, Oregon: II. Diagenetic modification of the sedimentary assemblage Geochimica et Cosmochimica Acta 55 2795–2810 10.1016/0016-7037(91)90445-B.CrossRefGoogle Scholar
Berner, R.A., 1984 Sedimentary pyrite formation: An update Geochimica et Cosmochimica Acta 48 605–615 10.1016/0016-7037(84)90089-9.CrossRefGoogle Scholar
Bodine, M.W. Jr, 1985 Trioctahedral clay mineral assem-bleges in Paleozoic marine evaporite rocks Sixth International Symposium on Salt .Google Scholar
Bodine, M.W. Jr Madsen, B.M., Schultz, L.G. Ol-phen, H. v. and Mumpton, F.A., 1987 Mixed-layer chlorite/smectites from a Pennsylvanian evaporite cycle, Grand County, Utah Proceedings of the International Clay Conference, Denver, 1985 .CrossRefGoogle Scholar
Bodine, M.W. Jr and Standaert, R.R., 1977 Chlorite and illite compositions from Upper Silurian rock salts, Retsof, New York Clays and Clay Minerals 25 57–71 10.1346/CCMN.1977.0250109.CrossRefGoogle Scholar
Brindley, G.W., 1955 Stevensite, a montmorillonite-type mineral showing mixed-layer characteristics American Mineralogist 40 239–247.Google Scholar
Buatier, M. Honnorez, J. and Ehret, G., 1989 Fe-smectite-glauconite transition in hydrothermal green clays from the Galapagos spreading center Clays and Clay Minerals 37 532–541 10.1346/CCMN.1989.0370605.CrossRefGoogle Scholar
Buatier, M.D. Peacor, D.R. and O’Neil, J.R., 1992 Smec-tite-illite transition in Barbados accretionary wedge sediments: TEM and AEM evidence for dissolution/crystallization at low temperature Clays and Clay Minerals 40 65–80 10.1346/CCMN.1992.0400108.CrossRefGoogle Scholar
Butler, G.P., 1969 Modern evaporite deposition and geochemistry of coexisting brines, the sabkha, Trucial Coast, Arabian Gulf Journal of Sedimentary Petrology 39 70–89.Google Scholar
Carpenter, A.B., 1978 Origin and chemical evolution of brines in sedimentary basins Oklahoma Geologic Survey Circular 79 60–77.Google Scholar
Clauer, N. O’Neil, J.R. Bonnot-Courtosi, C. and Holtzapf-fel, T., 1990 Morphological, chemical and isotopic evidence for an early diagenetic evolution of detrital smectite in marine sediments Clays and Clay Minerals 38 33–46 10.1346/CCMN.1990.0380105.CrossRefGoogle Scholar
Dong, H. and Peacor, D.R., 1996 TEM observations of coherent stacking relations in smectite, I/S and illite of shales: Evidence for MacEwan crystallites and dominance of 2M1 polytypism Clays and Clay Minerals 44 257–275 10.1346/CCMN.1996.0440211.CrossRefGoogle Scholar
Drever, J.I., 1971 Magnesium-iron replacement in clay minerals in anoxic marine sediments Science 172 1334–1336 10.1126/science.172.3990.1334.CrossRefGoogle ScholarPubMed
Drever, J.I., 1973 The preparation of oriented clay mineral specimens for X-ray diffraction analysis by a filter-membrane peel technique American Mineralogist 58 553–554.Google Scholar
Droste, J.B., 1963 Clay mineral composition of evaporite sequences Symposium on Salt, Northern Ohio Geologic Society 47–54.Google Scholar
Dyni, J.R., 1976 Trioctahedral smectite in the Green River Formation, Duchesne County, Utah US Geologic Survey Professional Paper 967 .CrossRefGoogle Scholar
Eberl, D.D. Jones, B.F. and Khoury, H.N., 1982 Mixed-layer kerolite/stevensite from the Amargosa Desert, Nevada Clays and Clay Minerals 30 321–326 10.1346/CCMN.1982.0300501.CrossRefGoogle Scholar
Eugster, H.P. Hardie, L.A. and Lerman, A., 1978 Saline Lakes Lakes, Chemistry, Geology, Physics .CrossRefGoogle Scholar
Eugster, H.P. and Jones, B.F., 1979 Behavior of major solutes during closed-basin brine evolution American Journal of Science 279 609–631 10.2475/ajs.279.6.609.CrossRefGoogle Scholar
Fisher, R.S., 1988 Clay minerals in evaporite host rocks, Palo Duro Basin, Texas Panhandle Journal of Sedimentary Petrology 58 836–844.Google Scholar
Gac, J.Y. Droubi, A. Fritz, B. and Tardy, Y., 1977 Geo-chemical behavior of silica and magnesium during the evaporation of waters in Chad Chemical Geology 19 215–228 10.1016/0009-2541(77)90016-X.CrossRefGoogle Scholar
Grim, R.E. Dietz, R.S. and Bradley, W.F., 1949 Clay mineral composition of some sediments from the Pacific Ocean off the California coast and the Gulf of California Geological Society of America Bulletin 60 1785–1808 10.1130/0016-7606(1949)60[1785:CMCOSS]2.0.CO;2.CrossRefGoogle Scholar
Güven, N., 1974 Lath-shaped units in fine-grained micas and smectites Clays and Clay Minerals 22 385–390 10.1346/CCMN.1974.0220504.CrossRefGoogle Scholar
Hansen, J.R. Hover, V.C. Walter, L.M. Lyons, T.W. Martini, A.M. and Robinson, D.M., 1993 Early siliciclastic diagenesis in an evaportive setting: Implications for C-S-Fe systematics and water/rock interactions Geological Society of America Abstracts with Programs 25 317–318.Google Scholar
Hillier, S., 1993 Origin, diagenesis, and mineralogy of chlorite minerals in Devonian Lacustrine mudrocks, Orcadian Basin, Scotland Clays and Clay Minerals 41 240–259 10.1346/CCMN.1993.0410211.CrossRefGoogle Scholar
Holser, W.T. and Burns, R.G., 1979 Mineralogy of evaporites Marine Minerals, Short Course Notes, Volume 6 .CrossRefGoogle Scholar
Humphreys, E.D. Weldon, RJ I, Dauphin, J.P. and Simoneit, B.R.T., 1991 Kinematic constraints on the rifting of Baja California The Gulf and Peninsular Province of the Californias .CrossRefGoogle Scholar
Jackson, M.L., 1969 Soil Chemical Analysis-Advanced Course. .Google Scholar
Jiang, W.-T. Essene, E.J. and Peacor, D.R., 1990 Transmission and analytical electron microscopic study of coexisting pyrophyllite and muscovite: Direct evidence for the metastability of illite Clays and Clay Minerals 38 225–240 10.1346/CCMN.1990.0380301.CrossRefGoogle Scholar
Jiang, W.-T. Peacor, D.R. Merriman, R.J. and Roberts, B., 1990 Transmission and analytical electron microscopic study of mixed-layer illite/smectite formed as an apparent replacement product of diagenetic illite Clays and Clay Minerals 38 449–468 10.1346/CCMN.1990.0380501.CrossRefGoogle Scholar
Jones, B.F. and Weir, A.H., 1983 Clay minerals of Lake Abert, an alkaline, saline lake Clays and Clay Minerals 31 161–172 10.1346/CCMN.1983.0310301.CrossRefGoogle Scholar
Jones, B.F. and Spencer, R.J., 1985 Clay minerals in the Great Salt Lake basin Programs and Abstract, 1985 International Clay Conference .Google Scholar
Khoury, H.N. Ebelr, D.D. and Jones, B.F., 1982 Origin of magnesium clays from the Amargosa Desert, Nevada Clays and Clay Minerals 30 327–336 10.1346/CCMN.1982.0300502.CrossRefGoogle Scholar
Kim, J.-W. Peacor, D.R. Tessier, D. and Elsass, F., 1995 A technique for maintaining texture and permanent expansion of smectite interlayers for TEM observations Clays and Clay Minerals 43 51–57 10.1346/CCMN.1995.0430106.CrossRefGoogle Scholar
Kinsman, D.J.J., 1969 Modes of formation, sedimentary associations, and diagnostic features of shallow-water and su−pratidal evaporites American Association of Petroleum Geologists Bulletin 53 830–840.Google Scholar
Larson, R.L. Menard, H.W. and Smith, S.M., 1968 Gulf of California: A result of ocean floor spreading and transform faulting Science 161 781–784 10.1126/science.161.3843.781.CrossRefGoogle ScholarPubMed
Lorimer, G.W. Cliff, G. and Wenk, H.R., 1976 Analytical electron microscopy of mineral Electron Microscopy in Mineralogy .CrossRefGoogle Scholar
Martini, A.M., 1997 Hydrochemistry of saline fluids and associated water and gas .Google Scholar
Martini, A.M. and Walter, L.M., 1993 Recent brines for the Salina Ometepec, Baja California: Chemical evolution of marine brines from a siliciclastic/evaporite environment Geological Society of America Abstracts with Programs 25 254.Google Scholar
Masuda, H. Tanaka, H. Gamo, T. O’Neil, J.R. Peacor, D.R. Jiang, W.-T., Khar-aka, Y.K. and Maest, A.S., 1992 Formation of authigenic smectite and zeolite and associated major element behavior during early diagenesis of volcanic ash in the Nankai Trough, Japan, ODP Leg 131 Water-Rock Interaction .Google Scholar
McCaffrey, M.A. Lazar, B. and Holland, H.D., 1987 The evaporation path of seawater and the coprecipitation of Br−and K+ with halite Journal of Sedimentary Petrology 57 928–937.Google Scholar
Merriam, R. and Bandy, O.L., 1965 Source of upper Ceno-zoic sediments in Colorado Delta region Journal of Sedimentary Petrology 35 911–916.Google Scholar
Millero, F.J., 1974 The physical chemistry of seawater Annual Review in Earth and Planetary Sciences 2 101–150 10.1146/annurev.ea.02.050174.000533.CrossRefGoogle Scholar
Moore, D.M. and Reynolds, R.C. Jr, 1997 X-ray Diffraction and the Identification and Analysis of Clay Minerals .Google Scholar
Ortlieb, L., Dauphin, J.P. and Simoneit, B.R.T., 1991 Quaternary vertical movements along the coasts of Baja California and Sonora The Gulf and Peninsular Province of the Californias .CrossRefGoogle Scholar
Peacor, D.R. and Buseck, P.R., 1992 Diagenesis and low grade metamorphism of shales and slates Minerals and Reactions at the Atomic Scale: Transmission Electron Microscopy, Reviews in Mineralogy, 27 .CrossRefGoogle Scholar
Reynolds, R.C. Jr, Brindley, G.W. and Brown, G., 1980 Interstratified clay minerals Crystal Structures of Clay Minerals and Their X-ray Identification .Google Scholar
Sawlan, M.G., Dauphin, J.P. and Simoneit, B.R.T., 1991 Magmatic evolution of the Gulf of California Rift The Gulf and Peninsular Province of the Californias .CrossRefGoogle Scholar
Seidell, B.C., 1984 The anatomy of a modern marine sili-ciclastic sabkha in a rift valley setting: Northwest Gulf of California tidal flats .Google Scholar
Shau, Y.-H. and Peacor, D.R., 1992 Phyllosilicates in hydro-thermally altered basalts from DSDP hole 504B, Leg 83- A TEM and AEM study Contributions to Mineralogy and Petrology 112 119–133 10.1007/BF00310959.CrossRefGoogle Scholar
Shearman, D.J., 1970 Recent halite rock, Baja California Institute of Mining and Metallurgy Transactions 79 155–162.Google Scholar
Singer, A. and Stoffers, P., 1980 Clay mineral diagenesis in two East African lake sediments Clay Minerals 5 291–307 10.1180/claymin.1980.015.3.09.CrossRefGoogle Scholar
Stoffers, P. and Singer, A., 1979 Clay minerals in Lake Mobuto Sese Seko (Lake Albert)-Their diagenetic changes as indicator of the paleoclimate Geologische Rundschau 68 1009–1024 10.1007/BF02274684.CrossRefGoogle Scholar
Suarez-Vidal, F. Armijo, R. Morgan, G. Bodin, P. Gas-til, R.G., Dauphin, J.P. and Simoneit, B.R.T., 1991 Framework of recent and active faulting in northern Baja California The Gulf and Peninsular Province of the Californias .CrossRefGoogle Scholar
Tardy, Y. Cheverry, C. and Fritz, B., 1974 Néoformation d’une argile magnésienne dan les dépressions interdunaires du lac Tchad: Application aux domaines de stabilité des phyllosilicates alumineaux mangésiens et ferriéres Comptes Rendue de l’Academie Sciences Paris Serie C 278 1999–2002.Google Scholar
Tettenhorst, R. and Moore, G.E. Jr, 1978 Stevensite oolites from the Green River Formation of Central Utah Journal of Sedimentary Petrology 48 587–594.Google Scholar
Thompson, R.W., 1968 Tidal flat sedimentation on the Colorado River delta, northwestern Gulf of California Geological Society of America Memoir 107 .CrossRefGoogle Scholar
Turner, C.E. and Fishman, N.S., 1991 Jurassic Lake T’oo’dichi’: A large alkaline, saline lake, Morrison Formation, eastern Colorado Plateau Geological Society of America Bulletin 103 538–558 10.1130/0016-7606(1991)103<0538:JLTODA>2.3.CO;2.2.3.CO;2>CrossRefGoogle Scholar
van der Pluijm, B.A. Lee, J.H. and Peacor, D.R., 1988 Analytical electron microscopy and the problem of potassium diffusion Clays and Clay Minerals 36 498–504 10.1346/CCMN.1988.0360603.CrossRefGoogle Scholar
Veblen, D.R. Guthrie, G.D. Livi, K.J.T. and Reynolds, R.C. Jr, 1990 High-resolution transmission electron microscopy and electron diffraction of mixed-layer illite/smectite: Experimental results Clays and Clay Minerals 38 1–13 10.1346/CCMN.1990.0380101.CrossRefGoogle Scholar
Vonder Haar, S.P. and Gorsline, D.S., 1975 Flooding frequency of hypersaline coastal environments determined by orbital imagery: Geologic implications Science 90 147–149 10.1126/science.190.4210.147.CrossRefGoogle Scholar
Walker, T.R. and Thompson, R.W., 1968 Late Quaternary geology of the San Felipe area, Baja California, Mexico Geology 76 479–485 10.1086/627346.Google Scholar
Walter, L.M. Bishof, S.A. Patterson, W.P. and Lyons, T.W., 1993 Dissolution and recrystallization in modern shelf carbonates: Evidence from pore water and sold phase chemistry Philosophical Transactions of the Royal Society (London) A344 27–36.Google Scholar
Walter, L.M. and Burton, E.A., 1990 Dissolution of recent platform carbonate sediments in marine pore waters American Journal of Science 290 601–643.CrossRefGoogle Scholar