scholarly journals Classification scheme for sedimentary and igneous rocks in Gale crater, Mars

Icarus ◽  
2017 ◽  
Vol 284 ◽  
pp. 1-17 ◽  
Author(s):  
N. Mangold ◽  
M.E. Schmidt ◽  
M.R. Fisk ◽  
O. Forni ◽  
S.M. McLennan ◽  
...  
Keyword(s):  
Classification Scheme ◽  
Igneous Rocks ◽  
Gale Crater

New multidimensional classification scheme of altered igneous rocks from performance comparison of isometric and modified log-ratio transformations of major elements

2020 ◽  
Vol 13 (4) ◽  
pp. 1031-1064
Author(s):  
Surendra P. Verma ◽  
Lorena Díaz-González ◽  
M. Abdelaly Rivera-Gómez ◽  
Mauricio Rosales-Rivera
Keyword(s):  
Classification Scheme ◽  
Major Elements ◽  
Performance Comparison ◽  
Igneous Rocks ◽  
Log Ratio

scholarly journals Lithology classification of volcanic rocks based on conventional logging data of machine learning: A case study of the eastern depression of Liaohe oil field

2021 ◽  
Vol 13 (1) ◽  
pp. 1245-1258
Author(s):  
Wang Wenhua ◽  
Wang Zhuwen ◽  
Han Ruiyi ◽  
Xu Fanghui ◽  
Qi Xinghua ◽  
...  
Keyword(s):  
Classification Scheme ◽  
Volcanic Rocks ◽  
Oil Field ◽  
Igneous Rocks ◽  
Support Vector ◽  
Training Set ◽  
Identification Schemes ◽  
Liaohe Basin

Abstract The reservoirs in the eastern depression of Liaohe basin are formed by multistage igneous eruption. The lithofacies and lithology are complex, and the lithology is mainly intermediate and basic igneous rocks. Based on the integration of debris data of igneous rocks and logging data, this article selected 6,462 continuous logging data with complete cuttings data and five conventional logging curves (RLLD, AC, DEN, GR, and CNL) from four wells in the eastern depression of Liaohe basin as the training set. A variety of lithologic identification schemes based on support vector machine and random forest are established to classify the pure igneous strata and actual strata. By comparing the classification results with the identification data of core slice and debris slice, a practical lithologic classification scheme for igneous rocks in the eastern depression of Liaohe basin is obtained, and the classification accuracy reaches 97.46%.

scholarly journals Classification of igneous rocks analyzed by ChemCam at Gale crater, Mars

Icarus ◽  
2017 ◽  
Vol 288 ◽  
pp. 265-283 ◽  
Author(s):  
Agnes Cousin ◽  
Violaine Sautter ◽  
Valérie Payré ◽  
Olivier Forni ◽  
Nicolas Mangold ◽  
...  
Keyword(s):  
Igneous Rocks ◽  
Gale Crater

Murchison's Research Method: An Example from Southern Norway

2008 ◽  
Vol 27 (1) ◽  
pp. 31-58 ◽  
Author(s):  
John Diemer
Keyword(s):  
Research Method ◽  
Classification Scheme ◽  
Country Rock ◽  
Metamorphic Grade ◽  
Igneous Rocks ◽  
Significant Advance ◽  
Paleozoic Rock ◽  
Basement Rocks ◽  
Igneous Intrusions ◽  
Southern Norway

Roderick Impey Murchison (1792-1871) was an eminent geologist whose reputation was in large part based on a research method that comprised an efficient fieldwork procedure followed by public presentations and publication of his findings. His research method enabled him to survey large areas rapidly, apply recent advances in the science of geology to those large areas, and present his results in a timely and widespread manner with maximum impact. This paper focuses on Murchison's two-week visit to Norway in 1844, and the presentation of his findings in the aftermath of that visit, to illustrate his research method in action. Not only did his work result in a significant advance in the understanding of the geology of Norway, but Murchison also applied his Norway results to issues of wide interest in the developing science of geology. In particular, his work in Norway resulted in: (1) an appreciation of the extent of Paleozoic rock systems in Norway; (2) a new name, Azoic, for the older, nonfossiliferous basement rocks; (3) the recognition of the effects of younger igneous intrusions on country rock; (4) a proposed classification scheme for metamorphic grade; and (5) a proposed classification scheme for igneous rocks based on the timing of intrusion.

Statistical analysis of classification

1966 ◽  
Vol 24 ◽  
pp. 188-189
Author(s):  
T. J. Deeming
Keyword(s):  
Multivariate Analysis ◽  
Statistical Analysis ◽  
Classification Scheme ◽  
Analytical Procedure ◽  
Narrow Band ◽  
Scientific Research ◽  
Maximum Amount ◽  
Amount Of Information

If we make a set of measurements, such as narrow-band or multicolour photo-electric measurements, which are designed to improve a scheme of classification, and in particular if they are designed to extend the number of dimensions of classification, i.e. the number of classification parameters, then some important problems of analytical procedure arise. First, it is important not to reproduce the errors of the classification scheme which we are trying to improve. Second, when trying to extend the number of dimensions of classification we have little or nothing with which to test the validity of the new parameters.Problems similar to these have occurred in other areas of scientific research (notably psychology and education) and the branch of Statistics called Multivariate Analysis has been developed to deal with them. The techniques of this subject are largely unknown to astronomers, but, if carefully applied, they should at the very least ensure that the astronomer gets the maximum amount of information out of his data and does not waste his time looking for information which is not there. More optimistically, these techniques are potentially capable of indicating the number of classification parameters necessary and giving specific formulas for computing them, as well as pinpointing those particular measurements which are most crucial for determining the classification parameters.

Introductory paper

1966 ◽  
Vol 24 ◽  
pp. 3-5
Author(s):  
W. W. Morgan
Keyword(s):  
Line Intensity ◽  
Classification Scheme ◽  
Two Dimensional ◽  
Spectral Classification ◽  
Dimensional Array ◽  
Rr Lyrae ◽  
Metallic Line ◽  
Introductory Paper ◽  
Parameter Varying ◽  
Definition Of

1. The definition of “normal” stars in spectral classification changes with time; at the time of the publication of theYerkes Spectral Atlasthe term “normal” was applied to stars whose spectra could be fitted smoothly into a two-dimensional array. Thus, at that time, weak-lined spectra (RR Lyrae and HD 140283) would have been considered peculiar. At the present time we would tend to classify such spectra as “normal”—in a more complicated classification scheme which would have a parameter varying with metallic-line intensity within a specific spectral subdivision.

A Perturbation Theory for the Population of Atomic Energy Levels in Non-Lte Plasmas

1988 ◽  
Vol 102 ◽  
pp. 343-347
Author(s):  
M. Klapisch
Keyword(s):  
Perturbation Theory ◽  
Small Parameter ◽  
Classification Scheme ◽  
Sum Rules ◽  
Energy Levels ◽  
Natural Classification ◽  
Quantum Numbers ◽  
Formal Expansion ◽  
Atomic Energy Levels ◽  
As Effects

AbstractA formal expansion of the CRM in powers of a small parameter is presented. The terms of the expansion are products of matrices. Inverses are interpreted as effects of cascades.It will be shown that this allows for the separation of the different contributions to the populations, thus providing a natural classification scheme for processes involving atoms in plasmas. Sum rules can be formulated, allowing the population of the levels, in some simple cases, to be related in a transparent way to the quantum numbers.

The value of Electron Microscope studies of imperfect natural diamonds

1990 ◽  
Vol 48 (4) ◽  
pp. 194-195
Author(s):  
J C Walmsley ◽  
A R Lang
Keyword(s):  
Electron Microscope ◽  
Classification Scheme ◽  
Natural Diamond ◽  
Sudden Change ◽  
Growth Conditions ◽  
Diamond Growth ◽  
Major Constituent ◽  
Natural Diamonds ◽  
Type Ia ◽  
Platelet Defects

Interest in the defects and impurities in natural diamond, which are found in even the most perfect stone, is driven by the fact that diamond growth occurs at a depth of over 120Km. They display characteristics associated with their origin and their journey through the mantle to the surface of the Earth. An optical classification scheme for diamond exists based largely on the presence and segregation of nitrogen. For example type Ia, which includes 98% of all natural diamonds, contain nitrogen aggregated into small non-paramagnetic clusters and usually contain sub-micrometre platelet defects on {100} planes. Numerous transmission electron microscope (TEM) studies of these platelets and associated features have been made e.g. . Some diamonds, however, contain imperfections and impurities that place them outside this main classification scheme. Two such types are described.First, coated-diamonds which possess gem quality cores enclosed by a rind that is rich in submicrometre sized mineral inclusions. The transition from core to coat is quite sharp indicating a sudden change in growth conditions, Figure 1. As part of a TEM study of the inclusions apatite has been identified as a major constituent of the impurity present in many inclusion cavities, Figure 2.

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