University of Bremen

About: University of Bremen is a education organization based out in Bremen, Germany. It is known for research contribution in the topics: Population & Glacial period. The organization has 14563 authors who have published 37279 publications receiving 970381 citations. The organization is also known as: Universität Bremen.

Seismic reflection evidence for a Dangerous Grounds miniplate: No extrusion origin for the South China Sea

Abstract: The collision of India and Asia has caused large strike-slip faults to form in east Asia, resulting in the "extrusion'' of crustal blocks toward the southeast since the Eocene as a result of the indentation of rigid India into Asia It has been suggested that the South China Sea opened as a result of relative motion between a rigid Indochina (Sundaland) block and China Alternative models propose that rifting and seafloor spreading were driven by trench forces to the south We test these competing models by analysis of seismic reflection profiles across the boundary between Sundaland and the southern rifted margin, known as the Dangerous Grounds We show that the southern boundary of the Dangerous Grounds is a subduction zone that jammed in the middle Miocene To the west the Dangerous Grounds are bounded by a strike-slip zone, also active until similar to 16 Ma, that becomes diffuse south of the now inactive South China Sea seafloor spreading center We place the western edge of the Dangerous Grounds just to the east of the Natuna Arch (Lupar Line) The West Baram Line is confirmed as originating as a major strike-slip fault within the Dangerous Grounds and is continuous with the Red River Fault Zone Because the Dangerous Grounds were independent of Sundaland until similar to 6 Ma, its motion cannot have been constrained by motion of this block, making extrusion impossible as a mechanism to rift the South China Sea SE motion by both the Dangerous Grounds and Sundaland suggests subduction forces were the primary trigger for plate motions Our reconstruction places a similar to 280 km upper limit on the motion on the Red River Fault and a similar to 1400 km width to the paleo-South China Sea

A concept of nearness

Abstract: This paper offers solutions for two problems which have attracted many topologists over the years: 1. (1) It provides a natural and reasonably simple concept of “nearness” which unifies various concepts of “topological structures” in the sense that the category Near of all nearness spaces and nearness preserving maps contains the categories (a) of all topological Ro-spaces and continuous maps, (b) of all uniform spaces and uniformly continuous maps (Weil [34], Turkey [33]), (c) of all proximity spaces and δ-maps (Efremovic [9], Smirnov [28,29]), (d) of all contiguity spaces and contiguity maps (Ivanova and Ivanov [17]) as nicely embedded (either bireflective or bicoreflective) full (!) subcategories. 2. (2) It provides a general method by means of which as many T1-extension of a T1-space can be obtained as might be reasonably expected; namely, all strict extensions (in the sense of Banaschewski [3]).