Lithologic composition of the Earth's continental surfaces derived from a new digital map emphasizing riverine material transfer

[1] A new digital map of the lithology of the continental surfaces is proposed in vector mode (n ≈ 8300, reaggregated at 0.5° × 0.5° resolution) for 15 rock types (plus water and ice) targeted to surficial Earth system analysis (chemical weathering, land erosion, carbon cycling, sediment formation, riverine fluxes, aquifer typology, coastal erosion). These types include acid (0.98% at global scale) and basic (5.75%) volcanics, acid (7.23%) and basic (0.20%) plutonics, Precambrian basement (11.52%) and metamorphic rocks (4.07%), consolidated siliciclastic rocks (16.28%), mixed sedimentary (7.75%), carbonates (10.40%), semi- to un-consolidated sedimentary rocks (10.05%), alluvial deposits (15.48%), loess (2.62%), dunes (1.54%) and evaporites (0.12%). Where sediments, volcanics and metamorphosed rocks are too intimately mixed, a complex lithology (5.45%) class is added. Average composition is then tabulated for continents, ocean drainage basins, relief types (n = 7), 10° latitudinal bands, geological periods (n = 7), and exorheic versus endorheic domain and for formerly glaciated regions. Surficial lithology is highly heterogeneous and major differences are noted in any of these ensembles. Expected findings include the importance of alluvium and unconsolidated deposits in plains and lowlands, of Precambrian and metamorphic rocks in mid-mountain areas, the occurrence of loess, dunes and evaporites in dry regions, and of carbonates in Europe. Less expected are the large occurrences of volcanics (74% of their outcrops) in highly dissected relief and the importance of loess in South America. Prevalence of carbonate rocks between 15°N and 65°N and of Precambrian plus metamorphics in two bands (25°S–15°N and north of 55°N) is confirmed. Asia and the Atlantic Ocean drainage basin, without Mediterranean and Black Sea, are the most representative ensembles. In cratons the influence of ancient geological periods is often masked by young sediments, while active orogens have a specific composition.

[1]  F. Niessen,et al.  Late Pleistocene Paleoriver Channels on the Laptev Sea Shelf - Implications from Sub-Bottom Profiling , 1999 .

[2]  Michel Meybeck,et al.  A New Typology for Mountains and Other Relief Classes , 2001 .

[3]  P. E. Potter.  Petrology and Chemistry of Modern Big River Sands , 1978, The Journal of Geology.

[4]  M. Meybeck.  Riverine transport of atmospheric carbon: Sources, global typology and budget , 1993 .

[5]  Robert Axelrod,et al.  The Global Environment , 1999 .

[6]  W. Steffen,et al.  Global Change and the Earth System: A Planet Under Pressure , 2005 .

[7]  C. Vörösmarty,et al.  Global water resources: vulnerability from climate change and population growth. , 2000, Science.

[8]  B. Hitchon,et al.  Hydrogeochemistry of the surface waters of the Mackenzie River drainage basin, Canada—I. Factors controlling inorganic composition , 1972 .

[9]  Charles J Vörösmarty,et al.  Geomorphometric attributes of the global system of rivers at 30-minute spatial resolution , 2000 .

[10]  S. L. Jansen,et al.  Basement and Sedimentary Recycling and Continental Evolution , 1979, The Journal of Geology.

[11]  J. Drever,et al.  The geochemistry of natural waters , 1988 .

[12]  Wolfgang Ludwig,et al.  Enhanced chemical weathering of rocks during the last glacial maximum: a sink for atmospheric CO2? , 1999 .

[13]  C. Vörösmarty,et al.  Anthropogenic sediment retention: major global impact from registered river impoundments , 2003 .

[14]  R. Stallard,et al.  Geochemistry of the Amazon: 2. The influence of geology and weathering environment on the dissolved load , 1983 .

[15]  Lee R. Kump,et al.  Global chemical erosion during the Last Glacial Maximum and the present: Sensitivity to changes in lithology and hydrology , 1994 .

[16]  A. B. Ronov.  PROBABLE CHANGES IN THE COMPOSITION OF SEA WATER DURING THE COURSE OF GEOLOGICAL TIME1 , 1968 .

[17]  M. Summerfield.  Geomophology and Global Tectonics , 2000 .

[18]  R. H. Meade,et al.  World-Wide Delivery of River Sediment to the Oceans , 1983, The Journal of Geology.

[19]  J. Catt.  Loess—Its Formation, Transport and Economic Significance , 1988 .

[20]  Wolfgang Ludwig,et al.  Worldwide distribution of continental rock lithology: Implications for the atmospheric/soil CO2 uptake by continental weathering and alkalinity river transport to the oceans , 2003 .

[21]  I. Jansen,et al.  Predicting sediment yield from climate and topography , 1974 .

[22]  W. Rose,et al.  Eruptive history of Earth's largest Quaternary caldera (Toba, Indonesia) clarified , 1991 .

[23]  John Wright.  The chemistry of the atmosphere , 2003 .

[24]  Shuh-Ji Kao,et al.  Exacerbation of erosion induced by human perturbation in a typical Oceania watershed: Insight from 45 years of hydrological records from the Lanyang-Hsi River, northeastern Taiwan , 2002 .

[25]  M. Meybeck.  Global chemical weathering of surficial rocks estimated from river dissolved loads , 1987 .

[26]  F. Beinroth.  Relationships between U.S. soil taxonomy, the Brazilian soil classification system, and FAO/UNESCO [Food and Agriculture Organization/United Nations, Educational, Scientific and Cultural Organization] soil units , 1975 .

[27]  H. D. Holland.  The chemistry of the atmosphere and oceans , 1978 .

[28]  B. Dupré,et al.  Global silicate weathering and CO2 consumption rates deduced from the chemistry of large rivers , 1999 .

[29]  Abraham Lerman,et al.  BIOGEOCHEMICAL RESPONSES OF THE CARBON CYCLE TO NATURAL AND HUMAN PERTURBATIONS: PAST, PRESENT, AND FUTURE , 1999 .

[30]  W. Burnett,et al.  Groundwater and pore water inputs to the coastal zone , 2003 .

[31]  S. Taylor,et al.  Geochemistry of loess, continental crustal composition and crustal model ages , 1983 .

[32]  J. Syvitski,et al.  Geomorphic/Tectonic Control of Sediment Discharge to the Ocean: The Importance of Small Mountainous Rivers , 1992, The Journal of Geology.

[33]  V. A. Ivanov,et al.  The problem of direct groundwater discharge to the seas , 1973 .

[34]  Charles J Vörösmarty,et al.  Global system of rivers: Its role in organizing continental land mass and defining land‐to‐ocean linkages , 2000 .

[35]  James N. Galloway,et al.  Pre-industrial and contemporary fluxes of nitrogen through rivers: a global assessment based on typology , 2004 .

[36]  Wolfgang Grabs,et al.  High‐resolution fields of global runoff combining observed river discharge and simulated water balances , 2002 .

[37]  N. Caraco,et al.  HUMAN IMPACT ON NITRATE EXPORT : AN ANALYSIS USING MAJOR WORLD RIVERS , 1999 .

[38]  M. Summerfield.  Global geomorphology: An introduction to the study of landforms , 1992 .

[39]  M. Pécsi.  Loess is not just the accumulation of dust , 1990 .

[40]  M. Meybeck.  Carbon, nitrogen, and phosphorus transport by world rivers , 1982 .

[41]  M. Grosjean,et al.  From nature-dominated to human-dominated environmental changes , 2000 .

[42]  A. B. Ronov,et al.  Quantitative analysis of Phanerozoic sedimentation , 1980 .

[43]  Harvey Blatt,et al.  Proportions of Exposed Igneous, Metamorphic, and Sedimentary Rocks , 1975 .

[44]  Michel Meybeck,et al.  Riverine quality at the Anthropocene: Propositions for global space and time analysis, illustrated by the Seine River , 2002, Aquatic Sciences.

[45]  C. Vörösmarty,et al.  Responses of Continental Aquatic Systems at the Global Scale: New Paradigms, New Methods , 2004 .

[46]  G. Einsele.  Sedimentary Basins: Evolution, Facies, and Sediment Budget , 1992 .

[47]  L. Kump,et al.  Lithologic and climatologic controls of river chemistry , 1994 .

[48]  R. Hooke.  On the history of humans as geomorphic agents , 2000 .

[49]  H. Duerr.  Vers une typologie des systèmes fluviaux à l'échelle globale : quelques concepts et exemples à résolution moyenne , 2003 .

[50]  J. Drever,et al.  The Geochemistry of Natural Waters: Surface and Groundwater Environments , 1997 .

[51]  P. Amiotte‐Suchet,et al.  Atmospheric CO2 consumption by continental erosion: present-day controls and implications for the last glacial maximum , 1998 .

[52]  C. Vörösmarty,et al.  Fluvial filtering of land-to-ocean fluxes: from natural Holocene variations to Anthropocene , 2005 .

[53]  W. Ludwig,et al.  River sediment discharge to the oceans: present-day controls and global budgets , 1998 .

[54]  R. Stallard.  River Chemistry, Geology, Geomorphology, and Soils in the Amazon and Orinoco Basins , 1985 .

[55]  C. France‐Lanord,et al.  WEATHERING PROCESSES IN THE GANGES-BRAHMAPUTRA BASIN AND THE RIVERINE ALKALINITY BUDGET , 1999 .

[56]  J. Probst,et al.  Carbon river fluxes and weathering CO2 consumption in the Congo and Amazon river basins , 1994 .

[57]  M. Meybeck.  5.08 – Global Occurrence of Major Elements in Rivers , 2003 .

[58]  Wolfgang Ludwig,et al.  Predicting the oceanic input of organic carbon by continental erosion , 1996 .

[59]  J. Holden,et al.  The storage and aging of continental runoff in large reservoir systems of the world , 1997 .

[60]  H. Füchtbauer.  Sediments and sedimentary rocks , 1974 .

[61]  R. Garrels,et al.  The carbonate-silicate geochemical cycle and its effect on atmospheric carbon dioxide over the past 100 million years , 1983 .

[62]  Lee R. Kump,et al.  Global chemical erosion over the last 250 MY: Variations due to changes in paleogeography, paleoclimate, and paleogeology , 1999 .

[63]  D. Conley.  Terrestrial ecosystems and the global biogeochemical silica cycle , 2002 .

[64]  O. Bricker,et al.  Chemical Weathering of Serpentinite in the Eastern Piedmont of Maryland , 1974 .

[65]  R. Garrels,et al.  Sedimentary Rock Types: Relative Proportions as a Function of Geological Time , 1969, Science.

[66]  C. Slomp,et al.  Nutrient inputs to the coastal ocean through submarine groundwater discharge: controls and potential impact , 2004 .

[67]  Hugo A. Loáiciga,et al.  Groundwater fluxes in the global hydrologic cycle: past, present and future , 1993 .

[68]  A. Bouwman,et al.  Global patterns of dissolved inorganic and particulate nitrogen inputs to coastal systems: Recent conditions and future projections , 2002 .

[69]  B. Dupré,et al.  The global control of silicate weathering rates and the coupling with physical erosion: new insights from rivers of the Canadian Shield , 2002 .

[70]  F. Mackenzie,et al.  Evolution of sedimentary rocks , 1971 .