|
|
ABSTRACT
Six samples from
Khmer sandstone sculptures dating to the 12th-13th centuries from the
collections of the National Museum of Cambodia were studied by cathodoluminescence
(CL). Macro- and some microscopic study suggested that these six sculptures
from Angkor Wat appear to be carved from the same sandstone. Thin-sections,
small samples roughly 1 cm by ½ cm and cut paper thin, were obtained
from each sculpture. These thin-sections were observed with CL a technique
that images the distribution of trace elements within mineral grains.
To use CL, the sample is placed under a vacuum, and an electron beam
is directed on the sample. Minerals luminesce in different colors, which
makes it possible to differentiate among mineral types. CL images were
taken of each sample and compiled into a composite showing the whole
sample as imaged with CL. These CL mosaics were modified in Photoshop
to create color-maps, showing each mineral subtype in a different color,
so they can be identified and categorized to obtain a pixel percentage
of each mineral subtype within a sample.
Digital
Maps
Digital
maps were created using digital imaging equipment, and then they were
used as maps for the CL imaging
Cathodoluminescence
Maps are used for mineral identification. Each mineral luminesces in
different colors, which makes identification possible.
Mineral
Subtypes were taken with the CL and supplied examples of the minerals
that are present in each sample. The subtypes supplied the characteristics
that define a mineral group. (K1695 subtypes shown)
CONCLUSIONS
The six samples
are similar in composition, and thus most likely have a common geological
provenance. Quartz and feldspars, which are the predominant mineral
components of these sandstones, showed similar luminescence features
and class proportions. Other grains in the sandstones were derived from
altered rock sources are in present in similar proportions. The results
of this study corroborate other types of petrographic analysis of these
samples, and further supporting the hypothesis that the sandstone of
these sculptures came from the same geological unit, and perhaps even
the same quarry.
ACKNOWLEDGEMENTS
NSF, Department
of Mineral Sciences, Lisa Collins, Tim Rose, Mary Sangrey, Freer / Sackler,
The National Museum of Cambodia, & NMNH
This research was
supported by a grant to the NMNH Research Training Program from the
National Science Foundation Research Experiences for Undergraduates
program, Award Number DBI-0243512.
Want
to ask a question? Visit the Message Board
Virtual
Poster Session Message Board
Here
you can to read other messages and comments, post your own message or
comment, and then receive feedback from the RTP participants.
Research
Training Program
Schedule
of Events |
Poster |
Student
Abstracts |
Photo
Gallery
Virtual
Poster Session
The
information presented here represents preliminary research as
the result of ten-weeks of investigation in-residence at the
National Museum of Natural History. This is not an official
publication of the information.
As preliminary information, results and/or findings should not
be cited as part of conclusive work. Please contact the authors
first if you wish to utilize the information presented here.
|
|
|
Research
from
Biology
|
BOTANY
Xavier Haro
Research
Experiences for Undergraduates
"Can
the species of Critoniopsis from Ecuador be easily identified?"
Poster
Abstract
/ Summary
Letter
|
BOTANY
Emily Moran
Research
Experiences for Undergraduates
"A
Morphological Revision of the Genus Erato DC (Compositae:Liabeae)"
Poster
Abstract
/ Summary
Letter
|
ENTOMOLOGY
Jonathan
Chen
Research
Experiences for Undergraduates
"The
origin of yeast cultivation in the fungus-growing ant genus Cyphomyrmex"
Poster
Abstract
/ Summary
Letter
|
|
INVERTEBRATE
ZOOLOGY
Adren Ashley
Research
Experiences for Undergraduates
"Intergeneric
Hybridization between the sand dollars Encope michelini and Mellita
isometra (Echinodermata: Echinoidea: Mellitidae)"
Poster
Abstract
/ Summary
Letter
|
|
VERTEBRATE
ZOOLOGY
BIRDS
Joaquin
Aldabe
Research
Experiences for Undergraduates
"Morphological
adaptations for terrestrial habits of the Scimita-Billed Woddcreeper (Drymornis
bridgesii)."
Poster
Abstract
/ Summary
Letter
|
VERTEBRATE
ZOOLOGY
FISHES
Neil
Aschliman
Research Experiences
for Undergraduates
"Relationships
of sauries and needlefishes (Teleostei: Scomberesocoidea) to the internally
fertilizing halfbeaks (Zenarchopteridae) based on the pharyngeal jaw
apparatus."
Poster
Abstract
/ Summary
Letter
|
VERTEBRATE
ZOOLOGY
FISHES
Mauricio
Torres Mejia
Research
Experiences for Undergraduates
"A
new Creagrutus (Teleostei: Characiformes) from Colombia and its
phylogenetic position within the genus."
Poster
Abstract
/ Summary
Letter
|
VERTEBRATE
ZOOLOGY
MAMMALS
James
Morgan
Research
Experiences for Undergraduates
"Skeletal
Morphology of Mammals; Soricid Feet in Relation to Phylogeny"
Poster
Abstract
/ Summary
Letter
|
|
VERTEBRATE
ZOOLOGY
MAMMALS
Miguel
Pinto
Research
Experiences for Undergraduates
"Identity
of an atypical bear from Alaska: The first documented wild hybrid bear
(Ursus americanus X Ursus arctos)?"
Poster
Abstract
/ Summary
Letter
|
VERTEBRATE
ZOOLOGY
MAMMALS
Adrienne
Sussman
Research
Experiences for Undergraduates
"The
beautiful squirrel of South East Asia: cranial morphology and variation"
Poster
Abstract
/ Summary
Letter
|
|
Research
from
Paleobiology
|
PALEOBIOLOGY
Anthony
Alvarez
Research
Experiences for Undergraduates
"GIS
Prediction of the Outcrop Area of the Paleocene-Eocene Thermal Maximum"
Poster
Abstract
/ Summary
Letter
|
PALEOBIOLOGY
Jorge
Velez
Research
Experiences for Undergraduates
"The
microvertebrates of Quarry Nine of the Morrison Formation; what environment
where they living in?"
Poster
Abstract
/ Summary
Letter
|
|
Research
from
Mineral Sciences
|
MINERAL
SCIENCE & GEOLOGY
Megan Brown
Research Experiences
for Undergraduates
"Sulfur
depletion on 433 Eros: Analyzing meteoritic analogs to compare possible
causes"
Poster
Abstract
/ Summary
Letter
|
MINERAL
SCIENCE & GEOLOGY
Amie
Garcia
Research
Experiences for Undergraduates
"A
cathodoluminescence study of microcline from the Morefield pegmatite,
Virginia"
Poster
Abstract
/ Summary
Letter
|
MINERAL
SCIENCES & GEOLOGY
Lee
Zelewicz
Research
Experiences for Undergraduates
"Cathodoluminescence
Analysis of Six Bayon Style Sculptures from Angkor Wat, Cambodia"
Poster
Abstract
/ Summary
Letter
|
|
Research
from
Anthropology
|
ANTHROPOLOGY
Lynn
Copes
Research
Experiences for Undergraduates
"The
Stratigraphic Precision of Paleoenvironmental Data in Relation to Hominin
Localities in the Turkana and Olduvai Basins, East Africa: how much
fuzz exists?"
Poster
Abstract
/ Summary
Letter
|
ANTHROPOLOGY
Digna
Ortiz
Research
Experiences for Undergraduates
"Testing
the Ceramic Chronology Sequence of the Steed-kisker Phase"
Poster
Abstract
/ Summary
Letter
|
ANTHROPOLOGY
Kathryn
Musica
Notre
Dame Internship Program in Anthropology
"NMNH
or Bust — Museum Sculptures of Native Americans"
Poster
Abstract
/ Summary
Letter
|
ANTHROPOLOGY
Andrew
Gaudreau
Notre
Dame Internship Program in Anthropology
"Discovering
Rastafari": A Case Study of Transnationalism"
Poster
Abstract
/ Summary
Letter
|
|
More
RTP Class of '04 Links
|
