scholarly journals Chemical differentiation of the Earth: the relationship between mantle, continental crust, and oceanic crust

1988 ◽  
Vol 90 (3) ◽  
pp. 297-314 ◽  
Author(s):  
Albrecht W. Hofmann
Keyword(s):  
Continental Crust ◽  
Oceanic Crust ◽  
The Earth ◽  
Chemical Differentiation ◽  
The Relationship

scholarly journals Towards understanding how surface life can affect interior geological processes: a non-equilibrium thermodynamics approach

2011 ◽  
Vol 2 (1) ◽  
pp. 139-160 ◽  
Author(s):  
J. G. Dyke ◽  
F. Gans ◽  
A. Kleidon
Keyword(s):  
Continental Crust ◽  
Oceanic Crust ◽  
Mantle Convection ◽  
Dynamical Models ◽  
Geological Processes ◽  
The Earth ◽  
Uplift And Erosion ◽  
Life On Earth ◽  
Mantle Temperature ◽  
Non Equilibrium

Abstract. Life has significantly altered the Earth's atmosphere, oceans and crust. To what extent has it also affected interior geological processes? To address this question, three models of geological processes are formulated: mantle convection, continental crust uplift and erosion and oceanic crust recycling. These processes are characterised as non-equilibrium thermodynamic systems. Their states of disequilibrium are maintained by the power generated from the dissipation of energy from the interior of the Earth. Altering the thickness of continental crust via weathering and erosion affects the upper mantle temperature which leads to changes in rates of oceanic crust recycling and consequently rates of outgassing of carbon dioxide into the atmosphere. Estimates for the power generated by various elements in the Earth system are shown. This includes, inter alia, surface life generation of 264 TW of power, much greater than those of geological processes such as mantle convection at 12 TW. This high power results from life's ability to harvest energy directly from the sun. Life need only utilise a small fraction of the generated free chemical energy for geochemical transformations at the surface, such as affecting rates of weathering and erosion of continental rocks, in order to affect interior, geological processes. Consequently when assessing the effects of life on Earth, and potentially any planet with a significant biosphere, dynamical models may be required that better capture the coupled nature of biologically-mediated surface and interior processes.

General discussion

1987 ◽  
Vol 321 (1557) ◽  
pp. 271-273
Keyword(s):  
Mathematical Models ◽  
Continental Crust ◽  
Oceanic Crust ◽  
Continuous Medium ◽  
The Urals ◽  
The Earth ◽  
Scandinavian Caledonides ◽  
Fold Belts ◽  
Normal Thickness

E. V. Artyushkov ( Institute of Physics of the Earth, Moscow, U.S.S.R .). Shortening of the crust has been modelled by compression of a continuous medium. It has also been supposed that compression can start in continental crust of normal thickness. Mathematical models of the same type have recently been used by some other authors. It should be noted that an intense shortening of the crust in fold belts never occurred in such a way. In the main Phanerozoic fold belts (the Urals, Appalachians, Scandinavian Caledonides, the Alpine and Verkhoyansk belts, and others) no era tonic block with a normal continental crust and lithosphere was shortened (Artyushkov & Baer 1983, 1984, 1986). An intense compression took place only in deep basins on oceanic or continental crust. Most oceanic crust disappeared from the surface in the process of subduction. Now the fold belts are mainly built up of a strongly compressed crust of deep basins on continental crust. How can it be proven that this crust was really thin?

Growth of Cratons and their Post-Stabilization Histories

2004 ◽  
Author(s):  
John J. W. Rogers ◽  
M. Santosh
Keyword(s):  
Continental Crust ◽  
Evolutionary Process ◽  
Major Elements ◽  
Tectonic Activity ◽  
Crustal Recycling ◽  
The Earth ◽  
History Of ◽  
Superior Craton ◽  
The Relationship ◽  
Comparative Stability

As we have seen in chapter 3, continental crust evolved from regions of the mantle that contained higher concentrations of LIL elements than regions that underlie typical ocean basins. The most complete record of this evolutionary process is in cratons, which passed through periods of rapid crust production to times of comparative stability over intervals of several hundred million years. After the cratons became stable enough to accumulate sequences of undeformed platform sediments, they moved about the earth without being subjected to further compressive tectonic activity. Because many of the cratons are also partly covered by sediments that are unmetamorphosed or only slightly metamorphosed, they appear to have undergone very little erosion since the sediments were deposited. Thus, a craton may be considered as a large block of continental crust that has been permanently removed from the crustal recycling process. This chapter starts with a discussion of the history of cratons as interpreted from studies of the upper part of the crust. We describe the Superior craton of the Canadian shield and the Western Dharwar craton of southern India within the chapter and use appendix E for brief summaries of other typical cratons. These cratons and numerous others elsewhere developed at different times during earth history, and we look for similarities and differences that may have been caused by progressive cooling of the earth (chapter 2). This section concludes with a summary of the general evolution of cratons and the meaning of the terms “Archean” and “Proterozoic.” The following section is an investigation of processes that occurred following stabilization, all of which take place in the presence of fluids that permeate the crust. We include a summary of these fluids and their effects on anorogenic magmatism and separation of the lower and upper crust. The final section discusses the relationship between cratons and their underlying subcontinental lithospheric mantle (SCLM). Continual metasomatism and metamorphism of the SCLM after cratons develop above it apparently has not destroyed the relationship between the ages of the cratons and the concentrations of major elements in the SCLM. This provides us with an opportunity to determine whether cratons evolved from the mantle beneath them or by depletion of much larger volumes of mantle. The discussions in this chapter are based partly on information summarized in appendices B (heat flow) and D (isotopes).

TO STRATIGRAPHY AND GEODYNAMICS ZILAIR SEDIMENTS IN THE SOUTHERN URALS

2021 ◽  
Vol 0 (3) ◽  
pp. 77-88
Author(s):  
T.T. KAZANTSEVA ◽  
Keyword(s):  
Conceptual Framework ◽  
Continental Crust ◽  
Southern Urals ◽  
Earth’S Crust ◽  
Spatial Relationships ◽  
The Southern Urals ◽  
Geological Processes ◽  
The Earth ◽  
Earth's Crust ◽  
The Relationship

It is known that the upper shell of our planet is the earth's crust, which is different in composition on the continents and in the oceans. The composition of the continental crust is predominantly sialic, and the oceanic one is simatic. The capacity of the first is within 35-70 km, the second is close to 5-12. The formation of any type of the earth's crust is determined by the participation of specific geological processes, causal relationships of matter and geodynamics, which is justified by researchers on the basis of well-proven facts and judgments. The concepts used must be specific, in accordance with well-known definitions, such as: stratigraphy is a branch of geology that studies «the formation of rocks in their primary spatial relationships», and geodynamics is «a branch of geology that studies the forces and processes in the crust, mantle and core of the Earth, deep and surface movements of masses in time and space» [1]. The use of the conceptual framework and the study of numerous facts allow us to confidently identify the sequence of connections and the reasons for the relationship.

ECOLOGICAL INTERPRETATIONS OF THE JONAH NARRATIVE – HAVE THEY SUCCEEDED IN OVERCOMING ANTHROPOCENTRISM?

2017 ◽  
Vol 23 (1) ◽  
Author(s):  
Willie Van Heerden
Keyword(s):  
Biblical Text ◽  
Biblical Hermeneutics ◽  
Central Concern ◽  
The Earth ◽  
Biblical Texts ◽  
The Relationship

A central concern of ecological biblical hermeneutics is to overcome the anthropocentric bias we are likely to find both in interpretations of the biblical texts and in the biblical text itself. One of the consequences of anthropocentrism has been described as a sense of distance, separation, and otherness in the relationship between humans and other members of the Earth community. This article is an attempt to determine whether extant ecological interpretations of the Jonah narrative have successfully addressed this sense of estrangement. The article focuses on the work of Ernst M. Conradie (2005), Raymond F. Person (2008), Yael Shemesh (2010), Brent A. Strawn (2012), and Phyllis Trible (1994, 1996).

scholarly journals Geocomputing, New Technologies and Historical Analysis: Tools for a Changing Planet

Proceedings ◽  
2019 ◽  
Vol 30 (1) ◽  
pp. 9
Author(s):  
Sebastiano Trevisani
Keyword(s):  
Quantitative Analysis ◽  
Philosophy Of Science ◽  
New Technologies ◽  
Historical Analysis ◽  
Holistic Approach ◽  
Research Topic ◽  
The Other ◽  
Historical Records ◽  
The Earth ◽  
The Relationship

Modern Earth Scientists need also to interact with other disciplines, apparently far from the Earth Sciences and Engineering. Disciplines related to history and philosophy of science are emblematic from this perspective. From one side, the quantitative analysis of information extracted from historical records (documents, maps, paintings, etc.) represents an exciting research topic, requiring a truly holistic approach. On the other side, epistemological and philosophy of science considerations on the relationship between geoscience and society in history are of fundamental importance for understanding past, present and future geosphere-anthroposphere interlinked dynamics.

scholarly journals Religion, Polity, and the Natural Environment in the Anthropocene Age

2020 ◽  
Author(s):  
Peyman Hekmatpour
Keyword(s):  
Natural Environment ◽  
Political Ideology ◽  
Human Impacts ◽  
Environmental Problems ◽  
Environmental Conservation ◽  
Political Organizations ◽  
Central Concept ◽  
The Earth ◽  
The Relationship ◽  
Level Of Analysis

The Anthropocene age is marked by increased human impacts on the natural environment. As social beings, humans interact with each other, and with their surrounding environments, often through organizations and institutions. Religion and the polity are among the most influential human institutions, and they tend to impact the natural environment in several ways. For instance, several thinkers have claimed that some of the central ideas of the Abrahamic traditions, such as the concept of “Domination of men over the earth,” are among the causes of several anthropogenic environmental problems. By contrast, some of the ideas of non-Abrahamic, particularly animistic, religions are found to be associated with environmental conservation and stewardship. The polity can also contribute to environmental problems. The relationship between political organizations and environmental degradation, at any level of analysis from local to global, is well studied and established in the literature. Politicizing the natural environment, however, is not without tradeoffs. Environmentalism, by certain groups of people, is considered as a “stigma,” while it is a central concept in the political ideology of another part of the population. This antagonism is harmful to the environmental protection cause. I make the case that religion, or at least a number of religious ideas, can be conducive to the process of depoliticizing the natural environment. In this paper, I strive to draw a theoretical framework to explain how religion and the polity can mutually impact the natural environment.

scholarly journals Staying Alive: Science Fiction in the Age of the Anthropocene — Philip K. Dick’s Pessimistic Humanism

2019 ◽  
Vol 3 (1) ◽  
Author(s):  
Tallulah Harvey
Keyword(s):  
Climate Change ◽  
Science Fiction ◽  
Environmental Politics ◽  
Public Awareness ◽  
Human Species ◽  
The Earth ◽  
Scientific Advancement ◽  
Negative Impacts ◽  
The Relationship ◽  
Impacts Of Climate Change

In recent years, literary studies have become increasingly invested in environmentalism. As science reveals the negative impacts of climate change, and demonstrates a growing concern for humanity’s contribution, literature operates as a form of cultural documentation. It details public awareness and anxieties, and acts as a conduit for change by urging empathetic responses and rendering ecological controversy accessible.To explore the relationship between literature and environmental politics, this paper will focus on the work of science fiction writer Philip K. Dick, and his dystopian visions. In his particular brand of sci-fi, there is no future for humanity. Science and technology fail to pave the way for a better and fairer society, but rather towards, as far as Dick is concerned, extinction. He argues that scientific advancement distances us from reality and from a sense of “humanness”. His pessimistic futures are nihilistic but tender; nurturing a love for humanity even in, what he considers to be, its final hours.Unlike the work of other prominent sci-fi writers, Dick’s fiction does not look towards the stars, but is in many ways a return to earth. The barren landscapes of Mars and other planets offer no comfort, and the evolution of the human into cyborgs, androids and post human species is depicted as dangerous and regressive. Dick’s apocalyptic visions ground his readers in the reality around them, acting in the present for the sake of the earth and humanity’s survival. His humanism is critical of grand enlightenment ideas of “progressivism”, and instead celebrates ordinariness. In the shadow of corporate capitalism and violent dictatorial governments, Dick prefers the little man, the ordinary everyday domestic hero for his narratives. His fiction urges us to take responsibility for our actions, and prepares us for the future through scepticism and pessimism, and a relentless fondness for the human.

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