{
    "tag": 12771,
    "title": "Geophysical properties, geochronologic, and geochemical data of sediment cores collected from San Pablo Bay, California, October 17-20, 2016",
    "pubdate": "20211015",
    "sername": null,
    "series_name": null,
    "issue": "DOI:10.5066\/P9BDEB3K",
    "publish": null,
    "publisher_name": null,
    "onlink": "https:\/\/cmgds.marine.usgs.gov\/catalog\/pcmsc\/DataReleases\/ScienceBase\/DR_P9BDEB3K\/SanPabloBayCoresOctober2016_metadata.faq.html",
    "format": null,
    "email": null,
    "descript": "Geophysical properties (P-wave velocity, gamma ray density, and magnetic susceptibility), geochronologic (radiocarbon, excess Lead-210, and Cesium-137), and geochemical data (organic carbon content and 60 element contents) are reported for select vibracores collected aboard the S\/V Retriever October 17-20, 2016, in San Pablo Bay, California. Geophysical properties were measured with a Geotek Multi-Sensor Core Logger (MSCL). Radiocarbon was measured by accelerator mass spectrometry (AMS). Excess Lead-210 and Cesium-137 activities were measured by gamma-ray counting in a high purity, low background germanium well detector (HPGe). Total organic carbon was measured in bulk sediment. Element contents were determined on the less than 0.063 mm (fine) size fraction of sediment by inductively coupled plasma mass spectrometry (ICP-MS).",
    "lang": null,
    "journal": null,
    "pwid": null,
    "originator": [
        {
            "name": "Takesue, Renee K.",
            "role": "Author"
        },
        {
            "name": "McGann, Mary L.",
            "role": "Author"
        },
        {
            "name": "Lorenson, Thomas D.",
            "role": "Author"
        },
        {
            "name": "Watt, Janet T.",
            "role": "Author"
        }
    ],
    "index_term": [
        {
            "thcode": 2,
            "code": "143",
            "name": "carbon-14 analysis",
            "scope": "Method to determine the age of organic geologic and archaeological specimens, aged approximately 3,000 to 50,000 years, by determining the decay of the radioactive isotope carbon-14."
        },
        {
            "thcode": 2,
            "code": "153",
            "name": "chemical analysis",
            "scope": "Chemical techniques used to identify the composition of substances."
        },
        {
            "thcode": 2,
            "code": "212",
            "name": "core analysis",
            "scope": "Study of the composition and layers of cylindrical samples of rocks, trees, ice, and other materials extracted by drilling into a mass. Intended for broad use for the analysis of all types of core samples. The combination of this term with other terms will convey the context of the activity."
        },
        {
            "thcode": 2,
            "code": "281",
            "name": "drilling and coring",
            "scope": "Cutting into the subsurface, for example into underground strata, ice, or a tree trunk, to remove material for examination. Intended for broad use wherever coring is done. The combination of this term with other terms will convey the context of the activity."
        },
        {
            "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": "706",
            "name": "marine geology",
            "scope": "Branch of geology concerned with the composition, geologic history, and earth processes of the ocean floor and the continental margin."
        },
        {
            "thcode": 2,
            "code": "757",
            "name": "mollusks",
            "scope": "Invertebrates belonging to the phylum Mollusca with soft, nonsegmented bodies, often covered by a hard shell.  Includes snails, clams, oysters, whelks, mussels, slugs, octopuses, and squids."
        },
        {
            "thcode": 2,
            "code": "954",
            "name": "radiometric dating",
            "scope": "Methods for age determination of rocks and fossils by measuring the proportions of naturally occurring radioactive isotopes to their decay products."
        },
        {
            "thcode": 2,
            "code": "1025",
            "name": "sea-floor characteristics",
            "scope": "Geomorphic features and geographic, compositional, and textural variation in the materials composing the ocean floor. Includes both large-scale structures (such as seamounts and rises) and fine-scale variations in rocks and deposits on the sea floor."
        },
        {
            "thcode": 2,
            "code": "2066",
            "name": "vibracoring",
            "scope": "Application of vibration to a coring device in order to achieve greater penetration for sampling unconsolidated material."
        },
        {
            "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": 15,
            "code": "014",
            "name": "oceans",
            "scope": "Features and characteristics of salt water bodies (excluding inland waters), for example tides, tidal waves, coastal information, reefs, maritime, outer continental shelf submerged lands, shoreline"
        },
        {
            "thcode": 23,
            "code": "4",
            "name": "Assessments",
            "scope": "Derived data that provide information about the values, impacts, drivers, connections, or functions of a feature in its present distribution."
        },
        {
            "thcode": 23,
            "code": "27",
            "name": "Habitat",
            "scope": "Habitat includes data that describe repeatable combinations of biota and associated chemical, physical, or geological features in a distinct place, which, as in the CMECS Biotic Component, generally are named for the dominant taxa living there. Habitat also includes biotopes in accordance with CMECS. Examples include seagrass beds, deep-water corals, benthos, nekton, plankton, mussel beds. Distributions for Habitat data subject types include records of biotic associations, habitats, or biotopes obtained through direct observation, imagery, collection, or other methods; Distributions also include biotope maps, predicted maps of present-day habitats (for example, the Northwest Atlantic Marine Ecoregional Assessment, Mapping European Seabed Habitats), and other compilations or interpretations from observed data. Assessments include ecological valuation indices, presence, quantity (hectares), or percentage of identified high-value habitats; other purpose-driven, regionally-specific indicators of ecological value; classifications of areas as critical habitat; ecological services models; evaluations of habitat condition; and place-based indices of susceptibility and vulnerability to disturbance. Predictions are the results of models or projections of future distributions, values, or impacts; anticipated changes produced by natural and human processes; future projections of cumulative impacts of single or multiple stressors; and scenario-testing habitat loss\/gain models and predictions of related ecological or economic effects under different management strategies."
        },
        {
            "thcode": 23,
            "code": "17",
            "name": "Material Resources",
            "scope": "Significant quantities of any naturally occurring nonliving substances that humans can potentially use for economic, nutritional, recreational, ecological, aesthetic, and other benefits. This category does not include energy resources, which are discussed previously. Distributions are recorded observations, interpreted data, or models of specified resources at known times and locations and can include added tangible information for the resource in question (for example, thickness of deposit). Assessments are evaluations of total resource availability, economic value, ecological function and value, drivers, difficulty of extraction, and sustainability; larger assessments that combine Resources and Uses categories can appropriately be included both here and in the other related Resources or Uses categories. Predictions are the results of models or projections of future distributions, values, or impacts of material resources; these data include modeled changes to resources due to natural and human processes. Examples include models of resource losses or gains under different rates of resource extraction, deposition, natural removal, and accumulation; models of how changes to one resource can affect other resources or uses; and models that compare outcomes of different management actions."
        },
        {
            "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": "711",
            "name": "geology",
            "scope": "the study of the Earth's structure, composition, past and present processes, and history."
        },
        {
            "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": [
        {
            "name": "https:\/\/www.sciencebase.gov\/catalog\/item\/60edab1ad34e48f871733fec?name=SP_cores_all.jpg",
            "description": "Map showing locations of cores collected (yellow circles) and fault lines (red) in San Pablo Bay."
        }
    ],
    "fan": [
        "2016-671-FA"
    ]
}