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  • Cambridge University Press (CUP)  (8)
  • 1
    Online Resource
    Online Resource
    Remanence Characteristics of Different Magnetic Grain Size Categories at Xifeng, Central Chinese Loess Plateau
    Cambridge University Press (CUP) ; 1994
    In:  Quaternary Research Vol. 42, No. 2 ( 1994-09), p. 162-165
    Details
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 42, No. 2 ( 1994-09), p. 162-165
    Abstract: Utilizing the thermal unblocking of low-temperature remanent magnetization in superparamagnetic (SP) ferrimagnets and the low-temperature demagnetization of multidomain (MD) magnetite remanences, the relative proportions of SP, MD, and singledomain (SD and SD-like) ferrimagnets are estimated in the topmost part of a loess section at Xifeng, China, which covers about the past 130,000 yr. SP ferrimagnets are commonly regarded as pedogenic (authigenic) products while the MD component is believed to have a detrital origin. These measurements, therefore, provide new data which improve our understanding of the characteristics and distribution of the different magnetic grain-size fractions present in loess and soils. In particular, our measurements indicate a larger MD fraction in soil than in loess, a result which indicates that although enhancement of the SP ferrimagnet fraction dominates the increased low-field magnetic susceptibility of paleosols, an enhancement of the MD fraction, probably through leaching, also plays an important role during pedogenesis.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    URL: Article
    DOI: 10.1006/qres.1994.1065
    RVK:
    RA 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1994
    detail.hit.zdb_id: 1471589-2
    detail.hit.zdb_id: 205711-6
    SSG: 13
    SSG: 14
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  • 2
    Online Resource
    Online Resource
    Biogenic Silica Record in Lake Biwa of Central Japan over the Past 145,000 Years
    Cambridge University Press (CUP) ; 1997
    In:  Quaternary Research Vol. 47, No. 3 ( 1997-05), p. 277-283
    Details
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 47, No. 3 ( 1997-05), p. 277-283
    Abstract: The record of the biogenic silica flux (BSF, g cm −2 (10 3 yr) −1 ) in Lake Biwa reflects changes in diatom productivity in the lake and provides information regarding changes in paleoclimatic conditions. The BSF record of Lake Biwa demonstrates five periods over the past ca. 145,000 yr when the BSF values were significantly greater than 7.5 g cm −2 (10 3 yr) −1 , and five intervals when they were lower. The data imply that paleoclimatic conditions were warmer and wetter from ca. 123,000 to 115,000, 103,000 to 95,000, 88,000 to 72,000, 57,000 to 32,000 yr B.P., and around ca. 6000 yr B.P. when the BSF values were greater, and relatively dry and cold from ca. 141,000 to 123,000 yr B.P. and during intervals between two of the five warm and wet episodes when the BSF values were lower. Time series of the BSF record can be correlated with the record of biogenic silica content in Lake Baikal and the marine oxygen isotope stages 1 through 6. Furthermore, the BSF values varied with much higher amplitude during the last interglaciation than during the last glaciation, probably implying that the diatom productivity in Lake Biwa was likewise more variable and had a larger range under interglacial conditions than under glacial conditions.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    URL: Article
    DOI: 10.1006/qres.1997.1884
    RVK:
    RA 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1997
    detail.hit.zdb_id: 1471589-2
    detail.hit.zdb_id: 205711-6
    SSG: 13
    SSG: 14
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  • 3
    Online Resource
    Online Resource
    Distribution of 14 C and 13 C in Forest Soils of the Dinghushan Biosphere Reserve
    Cambridge University Press (CUP) ; 2001
    In:  Radiocarbon Vol. 43, No. 2B ( 2001), p. 671-678
    Details
    In: Radiocarbon, Cambridge University Press (CUP), Vol. 43, No. 2B ( 2001), p. 671-678
    Abstract: We report here first results on the bulk soil organic carbon (SOC), apparent radiocarbon ages and δ 13 C characteristics of the tropical and subtropical forest soil in Dinghushan Biosphere Reserve (DHSBR). The forest oxisol in Dinghushan has developed during the Holocene. The δ 13 C variation curves in all three profiles may be divided into two sections. The upper section from 0 to 40 cm has δ 13 C values varying from −27.4 to −24.1‰, −27.5 to −22.2‰, and −24.4 to −20.1‰. in the Wukesong, Qingyunsi and Kengkou profiles, respectively. The lower section, including the 40–160 cm horizons, has a uniform δ 13 C. The mean δ 13 C values of the soil organic carbon could be used not only to discriminate between C 3 and C 4 plants, but also to distinguish between coniferous and broad-leaf plants.
    Type of Medium: Online Resource
    ISSN: 0033-8222 , 1945-5755
    URL: Article
    DOI: 10.1017/S0033822200041321
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2001
    detail.hit.zdb_id: 2028560-7
    SSG: 11
    SSG: 13
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  • 4
    Online Resource
    Online Resource
    Stratigraphic Evidence for the Uplift of the Tibetan Plateau between ∼1.1 and ∼0.9 myr Ago
    Cambridge University Press (CUP) ; 2000
    In:  Quaternary Research Vol. 54, No. 3 ( 2000-11), p. 309-320
    Details
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 54, No. 3 ( 2000-11), p. 309-320
    Abstract: Uplift of the Tibetan Plateau is manifest not only in widespread denudation, but also by an increased deposition rate of sediment, near or far from the exhumed regions. Our results indicate that the mass accumulation rate (MAR) of eolian dust increased between ∼1.1 and ∼0.9 myr ago. We associate this increase in MAR and median grain size with uplift of the Tibetan Plateau and its adjacent regions during this period. This Middle Pleistocene uplift can also be evidenced by the age of volcanism in the marginal region, the existence of thick conglomerate deposits surrounding the uplifted plateau, and the increased sedimentation rate of lacustrine deposits in the Qaidam Basin (northeastern Tibetan Plateau) between ∼1.1 and ∼0.9 myr ago. The correlation between the loess and marine records indicates that after ∼0.9 myr ago, these two records correlate well. This good correlation probably suggest that the Middle Pleistocene upheaval event not only brought the plateau into the cryosphere, but also enhanced the coupling of regional-scale Chinese loess transportation and deposition to the global ice volume variations through its effects on glacial grinding, rock denudation, and east Asian monsoonal circulation.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    URL: Article
    DOI: 10.1006/qres.2000.2170
    RVK:
    RA 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 2000
    detail.hit.zdb_id: 1471589-2
    detail.hit.zdb_id: 205711-6
    SSG: 13
    SSG: 14
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  • 5
    Online Resource
    Online Resource
    Ice-Volume Forcing of East Asian Winter Monsoon Variations in the Past 800,000 Years
    Cambridge University Press (CUP) ; 1995
    In:  Quaternary Research Vol. 44, No. 2 ( 1995-09), p. 149-159
    Details
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 44, No. 2 ( 1995-09), p. 149-159
    Abstract: Particle-size measurements of some typical loess-soil samples taken in different localities of the Chinese Loess Plateau demonstrate that the grain size ratio of 〈 2 μm/ 〉 10 μm (%) can be used as an indicator of variations in intensity of the East Asian winter monsoon winds. Grain-size curves of the Baoji and Weinan sections show that this proxy indicator is very sensitive to loess-soil alterations. Analytical results also suggest that during soil-forming periods, eolian dust accumulation was still substantial and, hence, loess deposition can be regarded as a nearly continuous process during the Quaternary period. In this study we compared the Baoji grain-size time series with the SPECMAP marine isotope record with the objective of elucidating the dynamic linkage between changes in global ice volume and the winter monsoon circulation. Both records show good agreement at both time and frequency domains. In particular, the winter monsoon variations are also dominated by a 100,000 yr period over the past 800,000 yr. It is thus inferred that direct local insolation forcing could be less important in driving the East Asian winter monsoon variability, and, alternatively, variations in glacial-age boundary conditions may have played a key role in modulating and pacing its strength and timing.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    URL: Article
    DOI: 10.1006/qres.1995.1059
    RVK:
    RA 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1995
    detail.hit.zdb_id: 1471589-2
    detail.hit.zdb_id: 205711-6
    SSG: 13
    SSG: 14
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  • 6
    Online Resource
    Online Resource
    Eolian Quartz Flux to Lake Biwa, Central Japan, over the Past 145,000 Years
    Cambridge University Press (CUP) ; 1997
    In:  Quaternary Research Vol. 48, No. 1 ( 1997-07), p. 48-57
    Details
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 48, No. 1 ( 1997-07), p. 48-57
    Abstract: Eolian quartz flux (EQF, g cm −2 (10 3 yr) −1 ) to Lake Biwa, central Japan, provides direct information on variations of the East Asian winter monsoon. Lake Biwa sediments spanning the past ca. 145,000 yr are characterized by two main periods when EQF values were significantly greater than 5.50 g cm −2 (10 3 yr) −1 , and two main intervals during which EQF values were lower. Two periods with EQF values 〉 5.50 g cm −2 (10 3 yr) −1 occurred from ca. 145,000 to 125,000 and 73,000 to 13,000 yr B.P., while times of lower EQF values occurred from ca. 125,000 to 73,000 yr B.P. and around ca. 5500 yr B.P. Between ca. 125,000 and 73,000 yr B.P., three minimum EQF values and two intervening peaks of slightly higher EQF values are recorded. EQF increased markedly from ca. 73,000 to 13,000 yr B.P., whereas between ca. 53,000 and 20,000 yr B.P. the values recorded were relatively lower than those recorded during either the preceding or the subsequent episodes. The data imply that the East Asian winter monsoon strengthened during the periods when EQF values were high, and weakened during the intervals with low EQF values. The EQF record of Lake Biwa can be correlated with the grain-size record of the quartz fraction in Chinese loess and with the SPECMAP marine δ 18 O record. However, the EQF record apparently lags ca. 5000 yr behind the loess and δ 18 O records during stage 6/5 and 2/1 transitions and ca. 10,000 yr during stage 5/4 transition. These apparent lags could be due to problems with the chronology; alternatively, they may imply that the eolian quartz flux depended more on the extent of dust source regions than on wind intensity during these transitions.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    URL: Article
    DOI: 10.1006/qres.1997.1893
    RVK:
    RA 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1997
    detail.hit.zdb_id: 1471589-2
    detail.hit.zdb_id: 205711-6
    SSG: 13
    SSG: 14
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  • 7
    Online Resource
    Online Resource
    Changes in Sand Content of Loess Deposits along a North–South Transect of the Chinese Loess Plateau and the Implications for Desert Variations
    Cambridge University Press (CUP) ; 1999
    In:  Quaternary Research Vol. 52, No. 1 ( 1999-07), p. 56-62
    Details
    In: Quaternary Research, Cambridge University Press (CUP), Vol. 52, No. 1 ( 1999-07), p. 56-62
    Abstract: Geological records have shown that the deserts east of the Helan Mountains in northern China were covered by grass during the Holocene Optimum, whereas during marine oxygen isotope stages 2 and 4 distribution of the deserts was almost the same as at present. The wide advance–retreat cycles of the deserts may have exerted an important control on grain-size changes in the loess of the Loess Plateau by altering the distance between the source and the accumulation zone of the loess. This challenges the widely accepted model that winter monsoon winds were the sole factor responsible for spatial and temporal changes in loess texture. To observe spatial changes in sedimentological characteristics of loess during the last glacial–interglacial cycle, the texture of loess was measured along a north–south transect of the Loess Plateau. This transect consists of nine loess sections, starting at Yulin in the transitional region between the Loess Plateau and the Mu Us Desert and ending at Weinan in the southernmost part of the Loess Plateau. Southward changes in sand ( 〉 63 μm) content along the transect suggest that variations in desert extent have indeed played a significant role in loess grain-size distributions, particularly in the northern part of the Loess Plateau. It is proposed that sand content ( 〉 63 μm%) of loess in the loess–desert transitional zone may be used as a proxy indicator for proximity to the desert margin.
    Type of Medium: Online Resource
    ISSN: 0033-5894 , 1096-0287
    URL: Article
    DOI: 10.1006/qres.1999.2045
    RVK:
    RA 1000
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1999
    detail.hit.zdb_id: 1471589-2
    detail.hit.zdb_id: 205711-6
    SSG: 13
    SSG: 14
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  • 8
    Online Resource
    Online Resource
    14 C Dating of Terrestrial Moss in Tern Lake Deposits, Antarctica
    Cambridge University Press (CUP) ; 1997
    In:  Radiocarbon Vol. 40, No. 2 ( 1997), p. 849-854
    Details
    In: Radiocarbon, Cambridge University Press (CUP), Vol. 40, No. 2 ( 1997), p. 849-854
    Abstract: Accurate radiocarbon ages were obtained from terrestrial moss from two drill holes in Tern Lake deposits, Antarctica, using liquid scintillation counting (LSC) and accelerator mass spectrometry (AMS). The results show that the lake deposits have been accumulating since the end of the last glacial epoch ca. 12,600 cal BP at the rate of 0.13–1.1 mm a -1 . We discuss the validity of 14 C ages of Antarctic lake deposits, with respect to the latitude effect of 14 C productivity, the reservoir effect, the environment effect and the hard-water effect.
    Type of Medium: Online Resource
    ISSN: 0033-8222 , 1945-5755
    URL: Article
    DOI: 10.1017/S0033822200018816
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1997
    detail.hit.zdb_id: 2028560-7
    SSG: 11
    SSG: 13
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