1. Coastal and Marine Hazards and Resources
  2. Geoscience Data System

Field Activity 2017-625-FA

Identifier 2017-625-FA
Also known as Puerto Rico geochemistry
Purpose Collect stream sediment samples and nearshore samples in southern Puerto Rico and Guanica Bay; collect forest soil samples
Location Southern Puerto Rico
Summary Collected 63 sediment samples and 21 bedrock samples.
Info derived Geochemical compositional data, strontium isotope ratios, sediment grain size distribution, organic carbon content, stable carbon isotope ratio
Comments 51 stream sediment samples collected on foot. 12 Marine samples collected from the University of Puerto Rico at Mayaguez, Magueyes Marine Lab 20-foot whaler.
Projects
Platform
Other
Vehicles
None
Itinerary
Start Guanica, Puerto Rico 2017-06-18
End Guanica, Puerto Rico 2018-03-30
Days in the field 7
Bounds
West -66.96716309
East -66.01285129
North 18.12546007
South 17.92813381

Personnel

Organization
2885 Mission Street
Santa Cruz, CA95060
(831) 460-7401
Principal investigators Renee K Takesue
Crew members
Information specialist(s)
Renee K Takesue
Specialist, Information
Affiliate principal Dr. Aaron Reyes, Westfield University, Massachusetts

Data types and categories

Data category: Location-Elevation, Sampling
Data type: Navigation, Geology

Equipment used

Equipment Usage description Data types Datasets
Handheld GPS Navigation (no data reported)
Hand-grab sample Biology, Chemistry, Geology 2

Datasets

Datasets produced in this activity

Dataset name Equipment Description Dataset contact
Southwest Puerto Rico Extractions Hand-grab sample Five-stage sequential extractions were performed on ultramafic soil from Bosque Susua and Guanica Dry Forest, stream sediment from Rios Loco and Yauco, and nearshore sediment from Guanica Bay in southwest Puerto Rico. Sequential extractions showed partitioning of geologically enriched metals and other elements among five phases: 1) adsorbed and calcium-bound, 2) iron-, manganese-oxyhydroxide-bound, 3) crystalline iron-oxide-bound, 4) sulfide-bound, and 5) residual. Total element contents are also reported. Soil and sediment were collected between June 19, 2017, and March 27, 2018. Renee K Takesue

Datasets compiled from multiple sources

Dataset name Equipment Description Dataset contact
Geochemical and isotopic compositions of stream sediment, parent rock, and nearshore sediment from southwest Puerto Rico, April 2017-June 2018 Hand-grab sample 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. Renee K Takesue