Meteoritical History of the Solar System

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Discussion Overview

The discussion revolves around the chronological timeline of the formation of solids in the solar system, specifically focusing on the sequence of events and the corresponding examples of meteorites associated with each step. The scope includes theoretical aspects of meteoritics and the formation processes within the solar nebula.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant proposes a timeline starting with the condensation of solids in the solar nebula, citing calcium aluminum inclusions in carbonaceous chondrites as examples.
  • The same participant suggests that chondrules form next, leading to the gravitational attraction and formation of minor planets, referencing petrological type 3 chondrites.
  • They continue by stating that collisions among minor planets increase, resulting in primitive achondrites due to internal and external heating.
  • Another point raised is that large asteroids become geologically differentiated, with iron meteorites as examples.
  • The participant mentions that asteroids accrete to form planetesimals, specifically noting HED achondrites from 4 Vesta.
  • Rocky planets are said to begin forming, with shergottites and some Earth rock as examples.
  • Planetary satellites are mentioned as being formed or captured, with lunar breccia as an example.
  • Another participant suggests that the original poster should list their sources, indicating that review articles may reveal controversies regarding the ages of various objects.
  • A later reply questions the classification of shergottites, introducing the Shergottite Age Paradox, which states that while shergottites are about 180 million years old, most geological activity on Mars predates this age.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correctness of the proposed timeline. There are competing views regarding the classification of shergottites and the implications of their age in relation to Mars's geological history.

Contextual Notes

There are indications of missing assumptions regarding the timeline and the definitions of terms used. The discussion also highlights unresolved questions about the ages of meteorites and the implications of these ages on the understanding of planetary formation.

connorp
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I'm trying to create a chronological timeline of the formation of solids in the solar system with examples of meteorites for each step. Let me know if this order looks right.

First solids condense in the solar nebula (Calcium aluminum inclusions in carbonaceous chrondrites).

Chondrules rapidly form and begin to gravitational attract each other, forming the first minor planets (petrological type 3 chondrites).

Collisions of minor planets became more frequent as more formed and they got larger. Primitive achondrites were formed as a results of increased internal heating (due to larger bodies) and external heating from collisions.

Large asteroids become geologically differentiated (iron meteorites).

Asteroids accrete to form planetesimals (HED achondrites from 4 Vesta).

Rocky planets begin to form (shergottites and some Earth rock).

Planetary satellites are formed or captured (lunar breccia).

Does this look correct?
 
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I'm sorry you are not finding help at the moment. Is there any additional information you can share with us?
 
Not really. All I really need clarification on is if the order is correct. Those are the only major events possible to include and the example specimens are definitely correct for each step. So just whether the order is right, which I suspect it is.
 
I think that you might want to list whatever sources that you are using. Review articles in the professional literature are often a good place to look. You may find various controversies about the ages of various objects. That's a natural part of cutting-edge research, and you ought to note that.

As to shergottites, they are not primordial. In fact, there is something called the Shergottite Age Paradox. Shergottites are about 180 million years old, but most of Mars's geological activity is much older than that. Are we lucky in getting lots of fragments from an impact event on some young rock?
 

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