straight creek fault造句

• Darrington to converge with the right-lateral strike-slip Straight Creek Fault at the OWL ( see map ).
• The Straight Creek Fault is a major structure in the North Cascades, but has not been active for over 30 million years.
• Various other faults in the North Cascades are older ( being offset by the Straight Creek Fault ) and are unrelated to the faults in Puget Sound.
• All this is explained by right-lateral strike-slip motion on the Straight Creek Fault, which initiated about 50 to 48 obducted ) onto the latter.
• This is about the time that the strike-slip movement on the north-striking Straight Creek Fault to the east ceased, due to the intrusions of plutons.
• Others have speculated that it simply ends, or turns and aligns with the OWL, or has been offset elsewhere . ( See discussion at Olympic-Wallowa Lineament # Straight Creek Fault .)
• Deposition of the Chuckanut continued as convergence of the Crescent Terrane ( Olympic Peninsula ) initiated strike-slip motion on the Straight Creek Fault ( 48 Ma ), displacing much of the original formation to the north.
• Continued deposition across the Straight Creek Fault formed the Raging River and Puget Group formations east of Seattle; the former is partly marine, indicating it was probably a large delta, and locating the Eocene coast line.
• This had repercussions on all the adjoining plates, and may have had something to do with initiation of the Straight Creek Fault, and the end of the Laramide orogeny ( the uplift of the Rocky Mountains ).
• Application to the OWL would require resolving some other questions, such as how traces of a ca . 150 Ma event resisted being swept north into Alaska to influence a structure believed to be no older than 41 Ma ( see Straight Creek Fault ).
• The Straight Creek Fault ( SCF ) & ndash; just east of Snoqualmie Pass and running nearly due north into Canada & ndash; is a major fault notable for considerable identified dextral strike-slip offset ( opposite side moving laterally to the right ) of at least.
• It appears that when the Straight Creek Fault became stuck the north & ndash; south compressive force that it had accommodated by strike-slip motion was transferred to the crust of the Puget Lowland, which subsequently folded and faulted, and the various blocks jammed over one another.
• Several other significant events occurred around 42 Ma, including cessation of metamorphism of the Leech River Schists ( resulting from the Metchosin / Crescent Formation being thrust under Vancouver Island ) and the end of strike-slip motion on the Straight Creek Fault; these may reflect the last movement of Siletzia relative to North America.
• In British Columbia, the western geologic boundary of the North Cascades is defined as the Fraser River as it follows the Straight Creek Fault, while in the United States the western boundary is defined by the Puget Lowlands in the west, although there are significant westward extensions of rocks similar in origin to those in the North Cascades found in the San Juan Islands.
• The period 48 & ndash; 50 Ma ( mid-Eocene ) is especially interesting as this is when the subducted Kula & mdash; Farallon spreading ridge passed below what is now the OWL . ( The Burke Museum has some nice diagrams of this . ) This also marks the onset of the Oregon rotation, possibly with rifting along the OWL, and the initiation of the Queen Charlotte and Straight Creek Faults.