{
    "tag": 12279,
    "title": "Geochemical and isotopic compositions of stream sediment, parent rock, and nearshore sediment from southwest Puerto Rico, April 2017-June 2018",
    "pubdate": "20190814",
    "sername": null,
    "series_name": null,
    "issue": "DOI:10.5066\/P9QEAV6O",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/pcmsc\/DataReleases\/ScienceBase\/DR_P9QEAV6O\/SouthwestPuertoRicoSedimentRockCompositions2017-2018_metadata.faq.html",
    "format": null,
    "email": null,
    "descript": "Geochemical and isotopic compositions were determined in stream sediment and parent rocks collected in April 2017 and June 2017 and in nearshore sediment collected bimonthly in sediment traps from May 2017 to June 2018 in the coastal zone and 12 drainages of southwest Puerto Rico: Rio Loco, Yauco, Guayanilla, Macana, Tallaboa, Matilde, Portugues, Bucana, Inabon, Jacaquas, Descalabrado, and Coamo. Geochemical compositional data include: a) total contents of major, minor, trace, and rare earth elements in the <0.063 mm-diameter fraction of terrestrial (n=53) and nearshore sediment (n=63) and powdered rocks (n=19) analyzed by inductively coupled plasma optical emission spectroscopy (ICP-OES) and inductively coupled plasma mass spectroscopy (ICP-MS); b) major oxide contents of stream sediment (n=46) and rocks (n=19) determined by wavelength dispersive x-ray fluorescence spectrometry (WD-XRF); and c) total organic carbon and carbonate contents of stream (n=48) and nearshore (n=64) sediment determined coulometrically. Isotopic compositional data include: 1) strontium isotope ratios (87Sr\/86Sr) determined by thermal ionization mass spectrometry in the <0.063 mm-diameter fraction of select stream (n=50) and nearshore (n=40) sediment, and in all rocks; and 2) activities of the short-lived cosmogenic nuclides beryllium-7, cesium-137, and excess (unsupported) lead-210 determined by gamma spectrometry on bulk nearshore sediment (n=44). The percentage by weight of the <0.063 mm-diameter sediment fraction (percent fines), the median grain size, and the silt to clay ratio are reported for stream (n=48) and nearshore (n=64) sediments. These data accompany Takesue, R.K., Sherman, C., Ramirez, N.I., Reyes, A.O., Cheriton, O.M., Rios, R.V., and Storlazzi, C.D., 2021, Land-based sediment sources and transport to southwest Puerto Rico coral reefs after Hurricane Maria, May 2017 to June 2018: Estuarine, Coastal and Shelf Science, v. 59, p. 107476, https:\/\/doi.org\/10.1016\/j.ecss.2021.107476.",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "Takesue, Renee K.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "437",
            "name": "geochemistry",
            "scope": "Study of the distribution of chemical elements and natural compounds on the earth and in the atmosphere and the chemical processes that affect the earth."
        },
        {
            "thcode": 2,
            "code": "609",
            "name": "isotopic analysis",
            "scope": "Experimental determination of the proportion of a given isotope (or isotopes) in a sample."
        },
        {
            "thcode": 2,
            "code": "711",
            "name": "mass spectroscopy",
            "scope": "Instrumental technique to separate and identify molecules.  Gaseous ions are formed, with or without fragmentation.  Their mass\/charge ratios and relative electrical abundance are then measured or the spectra are recorded."
        },
        {
            "thcode": 2,
            "code": "1553",
            "name": "rare earth elements",
            "scope": "A group of elements including the lanthanoids, or lanthanides, of interest because they are used in modern technological industries.  Yttrium and scandium are often included in this group."
        },
        {
            "thcode": 2,
            "code": "1005",
            "name": "rocks and deposits",
            "scope": "Solid masses that make up the earth's crust as well as accumulations of materials. Use for major rock types and unconsolidated deposits. For deposits of economic value, see related terms."
        },
        {
            "thcode": 15,
            "code": "007",
            "name": "environment",
            "scope": "Environmental resources, protection and conservation, for example environmental pollution, waste storage and treatment, environmental impact assessment, monitoring environmental risk, nature reserves, landscape, water quality, air quality, environmental modeling"
        },
        {
            "thcode": 15,
            "code": "008",
            "name": "geoscientificInformation",
            "scope": "Information pertaining to earth sciences, for example geophysical features and processes, geology, minerals, sciences dealing with the composition, structure and origin of the earth's rocks, risks of earthquakes, volcanic activity, landslides, gravity information, soils, permafrost, hydrogeology, groundwater, erosion"
        },
        {
            "thcode": 23,
            "code": "23",
            "name": "Substrate",
            "scope": "Represents the character and composition of the surface and near surface of the sea floor in subtidal or intertidal areas, as defined in the Substrate Component of CMECS or in similar classification systems. Distributions are records of substrate characteristics based on visual or photographic inspection or on analysis of samples and cores, and they also include interpretive maps classifying areas on the basis of combinations of observations, hydrodynamic models, or geological models. Assessments include evaluations of present ecological or economic values of substrate distributions, drivers of substrate change, and functions of substrates. Predictions are the results of models or projections of future substrate distributions, values, or ecological impacts, including predicted substrate changes due to natural and human forces including erosion, accretion, sea-level change, extraction, trawling, or other factors; and they are the results of scenario-based models of substrate changes on ecological or economic values under different management strategies or other human alterations."
        },
        {
            "thcode": 61,
            "code": "696",
            "name": "bedrock geochemistry",
            "scope": "the study of the chemical composition and genesis of earth materials within the lithospere."
        },
        {
            "thcode": 61,
            "code": "699",
            "name": "isotope geochemistry",
            "scope": "used for both stable isotope geochemistry (to understand chemical fractionation in earth materials and processes) and radiogenic isotope geochemistry (to determine the ages and origins of earth materials)."
        },
        {
            "thcode": 61,
            "code": "504",
            "name": "radiometric dating",
            "scope": "used for all absolute dating techniques based on analyzing the abundance of a radioactive isotope and its decay products in a given geologic (or archaeologic) sample."
        },
        {
            "thcode": 61,
            "code": "700",
            "name": "sediment geochemistry",
            "scope": "the study of the chemical composition and cycling of sedimentary systems."
        }
    ],
    "place_term": [],
    "image": [],
    "fan": [
        "2017-618-FA",
        "2017-625-FA",
        "2017-673-FA"
    ]
}