IGSN: DSR0000TI

     
     IGSN: DSR0000TI
  Sample Name: VM15-10
  Other Name(s):
  Sample Type: Dredge
  Parent IGSN: Not Provided
     
Description
Field Name: Not Provided
Description: Dredge contains 41 rock fragments of various types. Roughly 50 % of the dredge is composed of basalt, 25 % of shale, 15 % of granite, and 10% of dacite. The smallest fragment measures 1.5 cm. x 1 cm. x .75 cm. and the largest 7 cm. x 4 cm. x 2 cm. In roundness, the fragments vary from subrounded to rounded. They are irregularly coated with bryozoans. 1. The basalt rocks can be divided into two main types. The first type includes the typical basalts the fragments that have a dark gray, fine-grained matrix. The second type is characterized by a fine-grained, green matrix. Occasional quartz crystals may be the only phenocrysts present (quartz less than 5 percent), or else the matrix may be full of phenocrysts of plagioclase and augite. There are 17 fragments in all. 2. The shale pebbles are gray and fine-grained on fresh surface. All are covered with 1-4 mm. of light brown clay that is mottled with iron oxide stains. Evidently the shale fragments were rolled in the clay. Several have elongate shape. The smallest measures 1.5 cm. x 1 cm. x .75 cm. There are 11 pieces of shale. 3. The granite fraction numbers 9 fragments. The smallest one has a size of 1.25 cm x 1.25 cm x .75 cm. Several of the fragments are fine-grained and could better be classed as rhyolites. 4. The last group includes two fragments of dacite. The smaller one has a size of 2 cm. x 1.5 cm x 1 cm. and the larger a size of 7 cm. x 3.5 cm. x 1.5 cm. Quartz, biotite, and hornblende can be distinguished in the matrices. The larger dacite fragment is thoroughly coated with two different species of bryozoa-one anastomosing, and the other circular in shape.
Age (min): Not Provided
Age (max): Not Provided
Collection Method: dredge
Collection Method Description: Not Provided
Size: Not Provided
Geological Age: Not Provided
Geological Unit: Not Provided
Comment: Not Provided
Purpose: Not Provided
Geolocation
Latitude start: -56.653
Latitude End: Not Provided
Longitude start: -66.863
Longitude End: Not Provided
Elevation start: -1137
Elevation End: -1177
Nav Type: Not Provided
Physiographic Feature: Not Provided
Name Of Physiographic Feature: Not Provided
Location Description: Not Provided
Locality: Not Provided
Locality Description: Not Provided
Country: Not Provided
State/Province: Not Provided
County: Not Provided
City: Not Provided
Collection
Field Program/Cruise: VM15
Platform Type: Ship
Platform Name: Vema
Platform Description: Not Provided
Launch Type: Not Provided
Launch Platform Name: Not Provided
Launch ID: Not Provided
Collector/Chief Scientist: Not Provided
Collector/Chief Scientist Detail: Not Provided
Collection Start Date: 1959-03-13
Collection End Date: Not Provided
Curation
Current Archive: LDEO
Current Archive Contact Details: Not Provided
Original Archive: Not Provided
Original Archive Contact Details: Not Provided
Related Samples
Parents: No Parents
Siblings: No Siblings
Children: No Children