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Donald Wayne Downey is an independent consulting petroleum geologist and co-owner of family-owned independent exploration company Roxanna Oil (Houston,TX)

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Geologic reports will be available for review at the AAPG 2012 Annual Meeting in Long Beach.


 

Registered Geologist CA #7487, TX #1539

AAPG Certified Petroleum Geologist #5838
Geographic Information Systems Professional #51955

 


 

Northern California Geological Society

Smartville Complex Field Trip

leader: Dr. Eldridge M. Moores with Dan Day

Video:


Photos:
NCGS Smartville Complex Field Trip


Maps:

View NCGS Smartville Complex ophiolite Field Trip in a larger map

Approximate locations:
39° 10' 55.27" N, 121° 17' 49.08" W Stop 2 - pillow basalts in roadcut
39° 20' 31.55" N, 121° 20' 11.82" W Stop 3 - sheeted dikes
39° 21' 42.28" N, 121° 19' 8.62" W Stop 4 - dikes and screens
39° 22' 21.44" N, 121° 12' 0.26" W Stop 5 - layered gabbros
39° 23' 40.18" N, 121° 8' 49.49" W Stop 7 - steeply dipping sediments with a few dikes
39° 22' 9.98" N, 121° 6' 20.79" W Stop 8 - olivine cumulates
39° 15' 53.67" N, 121° 3' 49.64" W Stop 9 - mantle tectonites
38° 53' 19.84" N, 121° 4' 4.09" W Stop 10 - American River Overlook



Keywords from Abstract in Smartville Complex Field Trip Registration Form:
Oroville Dam south abutment, Rubia ribbon continent, Smartsville (current
PO usage), Smartville (Smartsville), Smartville Complex, Stanfield Hill locality, Wolf
Creek Fault zone, Auburn Dam, California, Central Belt of the Sierra Nevada, Great
Valley, Jarbo Gap Complex, Lake Combie Complex, Slate Creek Complex, Marysville Road
locality, Higgins Corner locality, andesites, diabase, gabbro, granitic, hornblende,
igneous, intrusive-extrusive, island-arc, lava, lavas, mélange, Mid-ocean ridge basalt
(MORB), olivine, ophiolites, ophiolitic, pillow, plagiogranite, plutons., pyroxene,
schistose., screens, serpentinite, sheeted dikes, subduction, sulfide, tholeiites,
volcanic, volcaniclastic


University of California at Davis, Past-president Geological Society of America

Past-president Northern California Geological Society; Dan's 1977 UC-Davis MS Thesis Study Area is Stop 3

All thanks to Dr. Eldridge Moores, Dan Day, and Tridib Guha (NCGS Counselor, Field Trips)

Abstract and field guide copyright © Northern California Geological Society 2010

Smartville Complex References

 

Bailey, E. H., and M. C. Blake Jr., Major chemical characteristics of Mesozoic Coast Range ophiolite in California, J. Res. U. S. Geol. Surv., 2(6), 637±656, 1974.

Bailey, E. H., M. C. Blake Jr., and D. L. Jones, On-land Mesozoic oceanic crust in California coast ranges, U. S. Geol. Surv. Prof. Pap., C70±C81, 1970.

Blake, M. C., Jr., A. S. Jayko, D. L. Jones, and B. W. Rogers, Unconformity between Coast Range ophiolite and part of the lower Great Valley Sequence, South Fork of Elder Creek, Tehama County, California, in Cordilleran Section of the Geological Society of America, Centennial Field Guide, edited by M. L. Hill, pp. 279±282, Geol. Soc. Am., Boulder, Colo., 1987.

Blake, M. C. Jr., A. S. Jayko, B. L. Murchey, and D. L. Jones, Formation and deformation of the Coast Range Ophiolite and related rocks near Paskenta, California, AAPG Bull., 76(3), 417, 1992.

Dickinson, W. R., C. A. Hopson, J. B. Saleeby, R. A. Schweickert, R. V. Ingersoll, E. A. Pessagno Jr., J. M. Mattinson, B. P. Luyendyk, W. Beebe, D. M. Hull, I. M. Munoz, and C. D. Blome, Alternate origins of the Coast Range Ophiolite (California): Introduction and implications, GSA Today, 6(2), 1±10, 1996.

Evarts, R. C., The geology and petrology of the Del Puerto Ophiolite, Diablo Range, central California Coast Ranges, in North American Ophiolites, Bull. Oreg. Dep. Geol. Miner. Ind., 95, 121±139, 1977.

Evarts, R. C., The Del Puerto ophiolite complex, California: A structural and petrologic investigation, doctoral thesis, Stanford Univ., Stanford, Calif., 1978.

Evarts, R. C., W. D. Sharp, and D. W. Phelps, The Del Puerto Canyon remnant of the Great Valley Ophiolite: Geochemical and age constraints on its formation and evolution, AAPG Bull., 76(3), 418, 1992.

Evarts, R. C., R. G. Coleman, and P. Schiffman, The Del Puerto ophiolite: Petrolgy and tectonic setting, in Geologic Field Trips in Northern California, edited by D. L. Wagner and S. A. Graham, pp. 136±149, Calif. Div. of Mines and Geol., Sacramento, Calif., 1999.

Giaramita, M. J., G. J. Macpherson, and S. P. Phipps, Forearc geochemical signatures in volcanic rocks, Llanada and Black Mountain remnants, Coast Range Ophiolite, California, Geol. Soc. Am. Abstr. Programs, 24(7), 42, 1992.

Giaramita, M., G. J. MacPherson, and S. P. Phipps, Petrologically diverse basalts from a fossil oceanic forearc in California: The Llanada and Black Mountain remnants of the Coast Range Ophiolite, Geol. Soc. Am. Bull., 110(5), 553±571, 1998.

 Hagstrum, J. T., and Anonymous, Paleomagnetism of the Mesozoic Coast Range Ophiolite, California, in AAPGSEPM- SEG-EMD Pacific Section Meeting, pp. 420± 421, Am. Assoc. of Pet. Geol., Tulsa, Okla., 1992.

Hagstrum, J. T., and B. L. Murchey, Paleomagnetism of Jurassic radiolarian chert above the Coast Range Ophiolite at Stanley Mountain, California, and implications for its paleogeographic origins, Geol. Soc. Am. Bull., 108(6), 643±652, 1996.

Hopson, C. A., and C. J. Frano, Igneous history of the Point Sal Ophiolite, southern California, in North American Ophiolites, edited by R. G. Coleman and W. P. Irwin, Bull. Oreg. Dep. Geol. Miner. Ind., 95, 161± 183, 1977.

Hopson, C. A., and J. S. Pallister, Semail ophiolite magma chamber, I, Evidence from gabbro phase variation, internal structure and layering, in Ophiolites: International Ophiolite Symposium, edited by A. Panayiotou, pp. 402±404, Geol. Surv. Dep., Nicosia, Cyprus, 1980.

Hopson, C. A., and J. S. Pallister, Plutonic processes in spreading ocean-ridge magma chambers, illustrated by the Samail Ophiolite, Oman, in Workshop on Magmatic Processes of Early Planetary Crusts, edited by D. C. Walker and I. S. C. McCallum, pp. 41±43, Billings and Nye, Mont., 1981.

Hopson, C. A., R. G. Coleman, R. T. Gregory, J. S. Pallister, and E. H. Bailey, Geologic section through the Samail ophiolite and associated rocks along a Muscat- Ibra transect, southeastern Oman Mountains, J. Geophys. Res., 86, 2527±2544, 1981a.

Hopson, C. A., J. M. Mattinson, and E. A. Pessagno Jr., Coast Range ophiolite, western California, in The Geotectonic Development of California, Rubey, vol. 1, edited by W. G. Ernst, pp. 418 ± 510, Prentice-Hall, Englewood Cliffs, N. J., 1981b.

Hopson, C. A., J. M. Mattinson, B. P. Luyendyk, W. Beebe, E. A. Pessagno Jr., D. M. Hull, and C. D. Blome, California Coast Range ophiolite: Jurassic tectonic history, AAPG Bull., 76(3), 422, 1992.

Hopson, C. A., J. M. Mattinson, B. P. Luyendyk, W. J. Beebe, E. A. Pessagno Jr., D. M. Hull, I. M. Munoz, and C. D. Blome, Coast Range ophiolite: Paleoequatorial ocean-ridge lithosphere, AAPG Bull., 81(4), 687, 1997.

Hull, D. M., Upper Jurassic radiolarian biostratigraphy of the lower member of the Taman Formation, east-central Mexico and of volcanopelagic strata overlying the Coast Range Ophiolite, Stanley Mountain, Southern California Coast Ranges, Doctoral thesis, Univ. of Tex. at Dallas, Richardson, 1991.

Hull, D. M., E. A. Pessagno Jr., C. D. Blome, C. A. Hopson, and I. M. Munoz, Chronostratigraphic assignment of volcanopelagic strata above the Coast Range Ophiolite, in Field Trip Guidebook, Pac. Sect.,Soc. of Econ. Paleontol. and Mineral., 71, 157±169, 1993.

Jackson, E. D., H. W. Green II, and E. M. Moores, The Vourinos ophiolite, Greece: Cyclic units of lineated cumulates overlying harzburgite tectonite, Geol. Soc. Am. Bull., 86(3), 390±398, 1975.

Jackson, H. S., Hydrothermal veins of layer 3 gabbros of the Point Sal Remnant, California Coast Range Ophiolite, Master's thesis, Univ. of Calif., Davis, 1992.

Jackson, H. S., and P. Schiffman, Hydrothermal metamorphism of layer 3 gabbroic rocks in the Point Sal remnant, California Coast Range ophiolite: A study of vein mineralogy, Geol. Soc. Am. Abstr. Programs, 22(7), 350, 1990.

Jayko, A. S., and M. C. Blake Jr., Significance of Klamath rocks between the Franciscan Complex and Coast Range ophiolite, northern California, Tectonics, 5(7), 1055±1071, 1986.

Jayko, A. S., M. C. Blake Jr., and T. A. Harms, Attenuation of the Coast Range ophiolite by extensional faulting, and nature of the Coast Range ``thrust,'' California, Tectonics, 6(4), 475±488, 1987.

Lagabrielle, Y., F. Roure, A. Coutelle, R. C. Maury, J.-L. Joron, and P. Thonon, The Coast Range ophiolites (northern California): Possible arc and back-arc basin remnants: Their relations with the Nevadan Orogeny, Etats-Unis, in Etats-Unis: ``Basin and Range'' et ``Metamorphic Core Complexes'', ``Coast Ranges'', Ophiolites et Series d'Arc, Mexique (United States: Basin and Range and Metamorphic Core Complexes, Coast Ranges, Ophiolites and Arc Series, Mexico), Geol. Cordill. Nord-Am., pp. 981±999, Geol. Soc. of France, Paris, 1986.

Mattinson, J. M., and C. A. Hopson, U/Pb ages of the Coast Range ophiolite: A critical reevaluation based on new high-precision Pb/Pb ages, AAPG Bull., 76(3), 425, 1992.

McLaughlin, R. J., M. C. Blake Jr., A. Griscom, C. D. Blome, and B. L. Murchey, Tectonics of formation, translation, and dispersal of the Coast Range ophiolite of California, Tectonics, 7(5), 1033±1056, 1988.

McLaughlin, R. J., R. W. Kistler, W. V. Sliter, B. L. Murchey, and C. R. Franck, Structure and character of Coast Range ophiolite and oceanic Franciscan terranes, Loma Prieta, Laurel, and Los Gatos quadrangles, California, Geol. Soc. Am. Abstr. Programs, 23(2), 77, 1991.

McLaughlin, R. J., R. W. Kistler, J. L. Wooden, and C. R. Franck, Coast Range ophiolite of the Sierra Azul Block southwest of Los Gatos, California, AAPG Bull., 76(3), 425, 1992.

 Page, B. M., Oceanic crust and mantle fragment in subduction complex near San Luis Obispo, California, Geol. Soc. Am. Bull., 83(4), 957±971, 1972.

Phipps, S. P., and G. J. Macpherson, The Coast Range ophiolite: Polygenetic crust in a late Mesozoic oceanic fore arc, AAPG Bull., 76(3), 428, 1992.

Robertson, A. H. F., Palaeoceanography and tectonic setting of the Jurassic Coast Range ophiolite, central California: Evidence from the extrusive rocks and the volcaniclastic sediment cover, Mar. Pet. Geol., 6(3), 194±220, 1989.

Robertson, A. H. F., Sedimentology and tectonic implications of ophiolite-derived clastics overlying the Jurassic Coast Range Ophiolite, northern California, Am. J. Sci., 290(2), 109±163, 1990.

Schiffman, P., P. Evarts, R. C. Williams, and W. J. Pickthorn, Hydrothermal metamorphism in oceanic crust from the Coast Range ophiolite of California: Fluid-rock interaction in a rifted island arc, in Ophiolite Genesis and Evolution of the Oceanic Lithosphere, edited by T. Peters, A. Nicolas, and R. J. Coleman, pp. 399±425, Kluwer Acad., Norwell, Mass., 1991.

Shervais, J. W., Ti-V plots and the petrogenesis of modern and ophiolitic lavas, Earth Planet. Sci. Lett., 59(1), 101±118, 1982.

Shervais, J. W., Island arc and ocean crust ophiolites: Contrasts in the petrology, geochemistry, and tectonic style of ophiolite assemblages in the California Coast Ranges, in Ophiolites: Oceanic Crustal Analogues: Proceedings of the Symposium ``Troodos 1987'', edited by J. Malpas, E. M. Moores, A. Panayiotou, and C. Xenophontos, pp. 507±520, Geol. Surv. Dep., Nicosia, Cyprus, 1990.

Shervais, J. W., Petrology, geochemistry, and origin of the Coast Range Ophiolite, California, AAPG Bull., 76(3), 430, 1992.

Shervais, J. W., Tectonic implications of oceanic basalts in the Coast Range ophiolite, California: Evidence for ridge subduction as final ophiolite-forming event, Geol. Soc. Am. Abstr. Programs, 25(6), 445, 1993.

Shervais, J. W., and B. J. Beaman, The Elder Creek ophiolite: Multi-stage magmatic history in a fore-arc ophiolite, northern California Coast Ranges, Geol. Soc. Am. Abstr. Programs, 23(5), A387, 1991.

Shervais, J. W., and B. B. Hanan, Jurassic volcanic glass from the Stonyford volcanic complex, Franciscan assemblage, northern California Coast Ranges, Geology, 17(6), 510±514, 1989.

Shervais, J. W., and D. L. Kimbrough, Some relationships between tectonic settings and alteration trends in the Coast Range Ophiolite of California, in Ophiolites: Oceanic Tectonics and Metamorphism, Ofioliti, edited by G. B. Piccardo and V. Bortolotti, Consig. Naz. delle Ric., Bologna, Italy, 1984.

Shervais, J. W., and D. L. Kimbrough, Geochemical evidence for the tectonic setting of the Coast Range ophiolite: A composite island arc-oceanic crust terrane in western California, Geology, 13(1), 35±38, 1985a.

Shervais, J. W., and D. L. Kimbrough, Geochemical evidence for the tectonic setting of the Coast Range ophiolite: A composite island arc-oceanic crust terrane in western California: Reply, Geology, 13(11), 828±829, 1985b.

Taylor, R. N., B. J. Murton, and R. W. Nesbitt, Chemical transects across intra-oceanic arcs: Implications for the tectonic setting of ophiolites, in Ophiolites and Their Modern Oceanic Analogues, edited by L. M. Parson, B. J. Murton, and P. Browning, Geol. Soc. Spec. Publ., 60, 117±132, 1992.

Wakabayashi, J., Tectono-metamorphic impact of a subduction- transform transition and implications for interpretation of orogenic belts, Int. Geol. Rev., 38(11), 979± 994, 1996.

Williams, K. M., The Mount Diablo Ophiolite, Contra Costa County, California, Masters thesis, San Jose State Univ., San Jose, Calif., 1983a.

Williams, K. M., Remnants of an apparent east-westtrending Middle Jurassic subduction and spreading-center system along the west margin of North America, in Proceedings of the Circum-Pacific Terrane Conference, edited by D. G. Howell, D. L. Jones, A. Cox, and A. M. Nur, pp. 208±211, Stanford Univ. Publ., Stanford, Calif., 1983b.

Williams, K. M., Geologic map and cross sections of the Coast Range Ophiolite at Mount Diablo, Contra Costa County, California, U.S. Geol. Surv. Open File Rep., 1 sheet, 1984.

Yule, D., The Coast Range Ophiolite debate: A perspective from its northern neighbor, the Josephine Ophiolite, SW Oregon, AAPG Bull., 81(4), 694, 1997.



Random thoughts:
Creating and Sharing Geologic Analog Field Studies via Social Media

Field study analogs provide insight into the subsurface geology we interpret to find
hydrocarbon reserves. Recent advances in web-based social media technologies now allow
geologists to publish field study analogs to a variety of audiences at no cost. Google
Earthâ„¢, Facebookâ„¢, Twitterâ„¢ and YouTubeâ„¢ allow creation of easily accessible web pages
allowing social interaction before, during and after the fieldwork project cycle. Our
field trip participants mapped the trip using Google Earthâ„¢ and gained an even deeper
understanding of the subject matter after viewing YouTubeâ„¢ field trip videos.

Information gathered in preparation of the field guide is captured digitally, propagated
into SQL field trip databases and published into dynamic web pages using PHP to push the
data into RSS feeds and XML data exchange templates. Background geology with
bibliographic references, meeting location and safety information including journey
planning are then available to all participants with internet access. Providing
references to the geologic literature available for the study area acknowledge the
contributions and reveals the lines of thought of previous workers improving discussions
in the field.

The images, descriptions and rock samples gathered during fieldwork often represent the
only record of a particular outcrop and social media facilitates the proper tagging and
archiving of this data allowing easy searching and access. The key to utilizing these
technologies is metadata tagging which allows search engines to find your web pages,
photos and video efficiently. Scripting of the metadata tagging allows automated
insertion of common tags such as field trip title and photographer; however, individual
photo captions are entered during the initial photo viewing and selection.

Although oil companies have embraced the PowerPoint® presentation culture, many have been
slow to embrace the richer creative environment of social media. Social media is scalable
and allow us to reach and interact with a global audience quickly at low cost. Publishing
field guidebooks via social media efficiently reaches the primary audiences of the
participants, academics and industry professionals, but can also make the geologic
interpretations available to teachers and their students, park interpreters and the
landowners. The AAPG can contribute by leading efforts to provide web templates for
teaching geologic field analogs.



Copyright © 2010 Don Downey