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Permian and Triassic Paleosols from the Beardmore Glacier Region, Antarctica WLG

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Permian and Triassic Paleosols from the Beardmore Glacier Region, Antarctica WLG Permian and Triassic paleosols from the Beardmore Glacier region, Antarctica WLG TIMOTHY C. HORNER and LAWRENCE A. KRISSEK \f 84S 84 Byrd Polar Research Center and Department of Geological Sciences M± MKP Ohio State University GVB Columbus, Ohio 43210 GV 0 I km. 50I . The study of fossil soils provides information about ancient 180 climates and general environmental conditions during deposi- tion of ancient rock units. To gain such information, Permian and Triassic paleosols (fossil soil horizons) were identified, de- scribed, and collected from outcrops in the Beardmore Glacier Antarctica region, Antarctica. The units examined in this study include the Permian Buckley Formation and the Triassic Fremouw For- Cr 165°E:7.0°E •:: mation. The depositional environment for each of these for- mations includes fluvial channels and overbank floodplains Figure 1. Location of the study area and paleosol sections that (Barrett, Elliot, and Lindsay 1986; Isbell 1990). Weakly to mod- were measured, collected, and described during the 1990-1991 erately developed paleosols are found in the floodplain sedi- field season. (km denotes kilometer. MAR denotes Mount Acker- ments that were deposited on the margins of the ancient river nay locality. GVA, GVB, and GVC are Gordon Valley localities. WLG systems. denotes Wahl Glacier locality. MKP is a measured section on Field work was accomplished during the 1990-1991 field sea- Mount Kirkpatrick.) son, with logistical support from the U.S. Navy VXE-6 Squad- ron and Helicopters New Zealand, Ltd. Daily operations were Permian and Triassic paleosols examined in this study are conducted from the Beardmore base camp on the Bowden generally thin, homogeneous, and poorly developed; therefore, Névé, and from smaller remote camps in the Queen Elizabeth the effects of soil-forming processes appear to have been rela- Range. Field identification of Triassic paleosols relied heavily tively uniform during that time. Possible controls on paleosol on the presence of rooted horizons (Retallack 1990). At one development are sedimentation rate, type of vegetation pre- Permian locality, we observed weak soil profile development in sent, sediment (substrate) grain size and composition, climate, addition to heavy rooting, which also indicates the presence of and water-table level. Root patterns within the paleosols may an ancient soil. During the field operations, 70 samples were provide information about the role of each of these factors in collected from 13 measured sections at five localities (figure 1). paleosol development. Roots are oriented both vertically and Seven sections were measured from the middle Fremouw For- horizontally, and range in size from 10 centimeters long and 2 mation, four were measured in the upper Fremouw Formation, centimeters thick to 0.5 centimeters long and 2 millimeters one section included the Buckley and the lower Fremouw for- thick. Most roots are 2 to 4 centimeters long, and 3 to 5 milli- mations, and one section was measured in the upper Buckley meters thick. Additional work may help to determine which of Formation. Multiple sections were measured at several of the the controls on soil-forming processes have contributed to the localities, allowing description of both lateral and vertical vari- root patterns that were observed in the Beardmore Glacier area. ations in the paleosols. Smaller scale structures are also visible in some heavily Weakly developed inceptisols (Retallack 1990) are common in rooted samples. Scanning electron microscope microanalysis the gray-green mudstones that were deposited on the flood- shows small carbonized fragments 0.1 to 0.3 millimeters thick plains of the Permian and Triassic river systems. Crevasse which branch laterally from mineralized vertical roots that are splays, channel migration, and overbank flooding each contrib- 2 to 3 centimeters in diameter (figure 3). These fragments are uted pulses of coarser sediment to the floodplain, resulting in interpreted to be compressed root hairs. Enigmatic crushed frequent burial of immature floodplain soils. Subsequently, tubules of smaller size also have been observed and may pro- new soils developed on the new land substrate, resulting in vide further information about soil-forming processes during stacked successions of buried soils. A typical stratigraphic Permian and Triassic time. Additional information about micro- succession containing paleosols (figure 2) illustrates the influ- morphology of the soils will also be gathered from thin section ence of channel systems on the floodplain deposits of the Fre- petrography. mouw Formation. Sixty-centimeter-thick to 2-meter-thick sand In summary, the paleosols that were observed in the Beard- bodies with erosional bases were deposited by channel sys- more Glacier area are relatively well exposed but poorly devel- tems, and thinner sand beds are the result of crevasse splays oped. Widespread lateral and vertical exposures within single or flooding events (Isbell and Mcdonald, Antarctic Journal, this extensive outcrops hold excellent promise for further detailed issue). Paleosols from the Beardmore Glacier area are weakly study of lateral and temporal variation in paleosol develop- developed as a result of their proximity to fluvial channels and ment. The poor development of Permian and Triassic soils is frequent rapid burial of the developing soils. probably due to rapid sediment supply and also may have been 1991 REVIEW Triassic Paleosols Gordon Valley, Antarctica 15 m. Shale: Green-gray mottled with dark red, carbonaceous Sandstone: Fine to medium grain, trough cross beds, erosional 14 m. base Slitston.: Light green-gray mottled with red-gray, vertical roots 2-4 cm. in diameter abundant at 13 m. base, relict bedding becomes more common toward top Shale: Dark gray to green-gray, slightly silty, blocky, trace silicified plant debris, trace fine (<2 mm. diameter) horizontal and vertical roots nm Shale: Red-gray mottled with light gray, blocky Figure 3. Scanning electron microscope photograph of small-scale root development in Triassic paleosols. Vertical root at the top of Shale: Dark gray, slightly silty, the photograph (highlighted with dashed line) is 1 centimeter in carbonaceous 10 m. diameter, mineralized, and perpendicular to bedding. Horizontal Shale: Red-gray with mottles of light root hairs 0.1 to 0.3 millimeter in diameter project outward from the gray, fine horizontal roots vertical root (see arrows), are carbonized, and lay parallel to the bedding surface. (mm denotes millimeter.) Slltston: Green-gray, rippled at base, fines upward, relict 9 bedding and vertical roots common throughout, roots are <3 mm. diameter Collinson and William Hammer for their cooperation with this Interbedded fins grained sandstone and sandy project. 8 slitatone: rippled Sandstone: Fine to medium grain, trough cross beds, erosional base Shale: Light gray to green-gray, 10- 15% vertical and horizontal roots 7 m. <3 mm. in diameter, slightly silty References Barrett, P.1., D. Elliot, and J, F, Lindsay. 1986. The Beacon Supergroup Figure 2. Typical paleosol section from the Triassic Fremouw For- (Devonian-Triassic) and Ferrar Group (Jurassic) in the Beardmore mation in the Beardmore Glacier region. Vertical roots appear to Glacier area, Antarctica. In M.D. Turner, and J.F. Splettstoesser be more common in silty beds adjacent to the sandy channel de- (Eds.), Geology of the central Transantarctic Mountains. (Antarctic Re- posits. This suggests that conditions of high sediment supply fa- search Series, Vol 36.) Washington, D.C.: American Geophysical vored plants with rapid vertical growth. (m denotes meter. cm de- Union. notes centimeter. mm denotes millimeter.) Isbell, J.L. 1990. Fluvial sedimentology and basin analysis of the Permian Fairchild and Buckley Formations, Beardmore Glacier region, and the Weller Coal Measures, southern Victoria Land, Antarctica. (Doctoral disserta- influenced by the type of vegetation present or the depth to the tion, Ohio State University, Columbus, Ohio,) water table. Isbell, J.L., and D.I.M. Mcdonald, 1991, Lithofacies analysis of the Triassic Fremouw Formation at the vertebrate site, Gordon Valley, This work was supported by National Science Foundation Antarctica. Antarctic Journal of the U.S., 26(5), grant DPP 88-17023. Special appreciation is extended to James Retallack, G.J. 1990, Soils of the past. Boston: Unwin Hyman. 8 ANTARCTIC JOURNAL.
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